/ GLOSSARY

Sports betting glossary

207 terms defined in plain English. Same data the NuroBets Discord bot uses for the /glossary command. If you have a term we should add, email hello@nurobets.ai.

#

"Lock": A supposed guaranteed winner. There are no locks. Anyone selling "locks" is selling a fantasy. Responsible handicappers never use the word.
1H (First Half): A bet on just the first half of a game. Popular in NFL/CBB. Often better liquidity than quarter bets.
2H (Second Half): A bet on just the second half of a game. Lines reset at halftime based on 1H score.

A

Action: Slang for betting volume, or the act of having a bet down. "I got action on the Lakers" = I bet on the Lakers.
Alt Line (Alternate): Non-standard spread/total/prop at different odds. Buy points for worse odds, sell points for better odds. Useful when you need a specific number.
American Odds: US format. -110 = risk $110 to win $100. +150 = risk $100 to win $150. Negative = favorite, positive = underdog.
Anytime TD Scorer: NFL prop: will player score any TD. More hittable than first TD. Popular SGP leg.
Arbitrage (Arb): Betting both sides across different sportsbooks to guarantee profit regardless of outcome. Tiny margins (0.5-3%) but risk-free.
Asian Handicap: Soccer spread with no-draw outcomes. Half and quarter lines split stake between 2 lines. Used on tight favorites.
Asian Line: Half-point handicap that eliminates the push. +0.25 = half stake at +0, half at +0.5. Popular on soccer.
Assists Prop: NBA prop: over/under assists for a player. Point guards dominate this market. Watch blowout risk (pulls starters).
ATS (Against The Spread): A bet on whether a team will cover the point spread. If Chiefs are -3.5, they must win by 4+ to cover ATS.

B

Backdoor Cover: A late garbage-time score that covers the spread when the game was otherwise decided. Painful if you were on the other side.
Bad Beat: Losing a bet that looked won. Missed free throw to cover, last-second TD with game decided, etc. Part of the variance.
Bankroll: Your total betting budget. Separate from personal finances. Treat it like a business account. If it hits zero, stop and reassess.
bet365: UK-origin global book, limited US rollout. Best early pricing on EPL, Champions League. Soft on golf props.
Betfair (Exchange): Peer-to-peer betting exchange. Bet for or against outcomes. Lay betting = betting against. Popular in UK/EU.
BetMGM: Third major US sportsbook. Tied to MGM casino rewards. Good parlay boosts. Slow to pay winners some markets.
Bonus Wager Requirement: Play-through on free bets: often 1x but can be 3x or more. Books that require 5x+ are traps. Always read T&C before opt-in.
Both Halves to Score: Each team scores at least 1 goal in each half. Uncommon prop. Decent value on high-total matches with poor defenses.
Bovada / offshore: Non-US-licensed offshore book. Accepts crypto. No legal protection. Not recommended.
BTTS (Both Teams To Score): Soccer prop: both teams score at least one goal. Yes/No outcomes. Popular Over/Under alternative.
Buying Points: Moving the spread in your favor at worse odds. Buying a half point across 3 in NFL costs -120 instead of -110. Usually -EV.

C

Caesars Sportsbook: Fourth major US book. Tied to Caesars Rewards. Best odds on most NFL spreads in select markets.
Capper (Handicapper): Someone who analyzes and picks bets. Verified cappers have third-party-tracked records with CLV data.
Cards Prop: Soccer prop: yellow/red cards. Referee identity matters more than teams. Ref-tight refs = over, lenient = under.
Cash Out: Book feature to settle a live bet early. Almost always -EV versus letting it ride. Books build in 3-7% extra juice.
Chalk: The favorite. "Betting the chalk" means taking the favored team. Heavy chalk = big favorite (-300 or more).
Chalky (Adjective): A slate or parlay full of favorites. "All chalk" means every leg is a favorite. Lower variance, lower payout.
Championship Futures: Season-long bets on who wins the title. Sharp money attacks opening week. Field bets (any non-favorite) often +EV in wide-open races.
Circa Sports: Vegas sharp book. Highest limits in Nevada, no-ban policy. $1M NFL contest. Sharps welcome.
Clean Sheet (Soccer): Team keeps opposition from scoring. Defender + goalkeeper prop. EPL strong defenses at home = value.
Closing Line: Final odds at game start. The "true" price because all sharp money has weighed in. Beating the close = edge.
CLV (Closing Line Value): The difference between your bet odds and the final closing odds. Consistently beating the close = you have real edge. The #1 metric for long-term profitability.
Confidence Interval: 95% CI on ROI after 500 bets: typically +/-5%. So reported ROI is rough. Use 1000+ bets before trusting claims.
Corners Prop: Soccer prop: total corner kicks. Driven by possession % and attacking style. Weak market = edge available.
Corners Unders: Soccer total corners bet. Teams that defend deep + counterattack = unders. Possession-dominant = overs.
Correct Score: Exact final score bet (soccer-heavy). Long odds (+500 to +2500). Low EV unless paired with strong model.
Correct Score (Soccer): Exact final score prediction. Long odds (+500 to +2500). Low hit rate. Popular derby/rivalry bet.
Correlation (SGP): When one leg hitting changes probability of another. SGP books price this in (compound vig), but missed correlations = EV.
Cover: When a team beats the spread. Favorite covers by winning by more than the spread. Underdog covers by losing by less or winning outright.
Cross-Sport Parlay: Parlay legs from different sports (NBA + NHL + MLB). Standard parlay vig, no correlation adjustment.

D

Daily Double: Horse bet: pick winner of 2 consecutive races. Popular track bet at nearly every US venue.
Dead Heat Rule: Golf/horse payout rule when multiple selections tie for a position. Payout is divided. Can turn +EV into -EV for placed bets.
Decimal Odds: European format. 2.00 = even money. 1.91 = -110 American. Multiply stake by decimal to get total payout including stake.
Devigging: Removing the sportsbook commission from odds to calculate true probability. Essential skill for +EV and arb hunting.
DFS (Daily Fantasy Sports): Lineup-building contests (DraftKings, FanDuel, PrizePicks, Underdog). Shares data and models with sports betting. Different legal framework per state.
DNB (Draw No Bet): Soccer market. Bet on Team A or Team B to win; if match draws, stake refunded. Lower payout vs moneyline.
Dog (Underdog): The team expected to lose. Getting + odds. "Live dog" = underdog that actually has a shot.
Double Chance: Soccer market covering 2 of 3 outcomes (e.g. Team A or draw). Shorter odds, higher hit rate.
DraftKings: Largest US sportsbook by handle. SGP + live + props. Strong promos for new users. Limits winners quickly.

E

Each Way: Horse/golf market: half stake on win, half on place (top 3-5). Half bet pays even if horse places but doesn't win.
Each Way (Golf): Half stake on outright win, half on top-5 or top-10 finish. Dead heat rule applies on ties. Check book T&C.
Early Cash Out: Book offer to settle a live bet mid-game. Almost always shaves 3-7% from fair value. Only cash out if game state changes drastically or you need to hedge liability.
Edge: The percentage advantage you have over the book. 2-3% edge is strong. 5%+ edge is rare and usually short-lived.
Esports Moneyline: Pick winner of match. Available for LoL, CS2, Valorant, Dota, Overwatch. Softer markets than traditional sports.
EV (Expected Value): The mathematical edge of a bet. +EV means profitable long-term. -EV means the house wins long-term. Formula: (Win% x Profit) - (Loss% x Stake).
Exacta: Horse bet: pick 1st AND 2nd in exact order. Box it to cover either order at 2x cost.

F

Fade: Betting against someone or a trend. "Fading the public" means betting the opposite of what most people bet.
Fading the Public: Betting against the popular side. Works best at 80%+ public money on one side with minimal line movement (book happy to take it).
Fanatics Sportsbook: Newest major entry (2024). PointsBetts US acquisition. Heavy promos year 1. Limits opening up.
FanDuel: Second-largest US sportsbook. Spawned from DFS. Known for NFL teasers and early live lines. Aggressive promo deposit match.
First 5 Innings (F5): MLB: bet on the score through 5 innings only. Isolates starting pitchers. Popular sharp market.
First Blood (Esports): Bet on which team gets first kill. MOBAs (LoL, Dota). Short-form prop, high variance.
First Goalscorer (Soccer): Who scores first goal in match. Anytime scorer is more reliable. Penalty takers + set-piece specialists have edge.
First Round Leader (FRL): Golf: player with lowest Round 1 score. Long odds, high variance. Weather Round 1 is a key input.
First TD Scorer: NFL prop: which player scores first TD. Long odds, lottery ticket. Anytime TD is more consistent value.
First to Score: Which team scores first. Binary prop with no juice smoothing. High variance.
Flat Betting: Wagering the same unit size on every bet regardless of confidence. Simple and survivable. Baseline strategy for most bettors.
Fractional Odds: UK format. 2/1 = win $2 per $1 staked. Common in horse racing. Decimal equivalent: fraction + 1.
Free Bet: Stake is not returned on win. Only profit pays out. Worth roughly 70% of face value. Use on long shots (+200 or higher).
Futures: Bets on season-long outcomes (champion, MVP, win totals). Money tied up for months. Shop for best price at open.

G

GamStop: UK self-exclusion program. Block yourself from all licensed UK books simultaneously. US equivalent: state voluntary exclusion registries.
Geofencing: Books check your GPS/IP location. Must be inside a legal state at time of bet. Bet placed inside, settled anywhere (usually).
Goals Prop: NHL/Soccer prop: total goals scored. Power play usage + goalie quality + line-mates all in the model.
Grand Slam: Covered 4+ legs of a parlay. MLB: HR with bases loaded. Tennis context: winning all 4 majors in a year.

H

Handle: Total amount of money wagered. "$100M handle" = $100M in total bets placed.
Handle Share: What % of total state handle each book captures. DK + FD dominate (70-80% combined in most states). Indicator of brand strength.
Hard Rock Bet: Florida-focused book. Fast live betting. Solid UFC and NBA player props. Limited states.
Head-to-Head (Golf): Match-up between 2 golfers: who finishes higher. Lower variance than outrights. Popular market for models.
Hedge: Betting the other side to lock in profit or minimize loss. Common on live parlays where one leg remains. Reduces variance but also EV.
Hedging Math: Formula: hedge stake = (original stake * original odds) / hedge odds. Lock in guaranteed profit on live parlays with one leg remaining.
Hits Allowed Prop: MLB pitcher or batter hits prop. Opposing team BABIP, ballpark factors, defensive alignment all matter.
Hold Percentage: What % of handle the book keeps as profit. NFL season hold = 7-9%. Books with <5% hold are too sharp and limit winners.
Home Runs Prop: MLB prop: player to hit 1+ HR. Long odds. Ballpark HR factor and pitcher flyball % drive value.
Home/Away Splits: Team performance at home vs on the road. Massive edge in college, meaningful in pro. Altitude (Denver) is its own category.
Hook: A half-point in the spread. "Getting the hook" at +3.5 vs +3 is valuable because 3 is a key number in football.
Horse - Place: Bet horse to finish 1st OR 2nd. Lower payout, higher hit rate than Win.
Horse - Show: Bet horse to finish 1st, 2nd, OR 3rd. Lowest payout, highest hit rate.
Horse - Win: Bet horse to finish 1st. Pays out at morning line odds modified by pool action.

I

If Bet: Chained bets where Bet 2 only activates if Bet 1 wins. Rare format. Useful for small bankrolls wanting parlay-style upside.
Implied Probability: Win % implied by the odds. -110 = 52.38%. +150 = 40%. Compare to your model's estimate to find EV.
Injury Report: Pregame list of injured players. Late scratches cause line movement. Subscribe to beat reporters for fastest info.

J

Juice / Vig (Vigorish): The sportsbook's commission. Standard is -110 on both sides (4.55% edge). The vig is how books make money.

K

Kelly Criterion: Mathematical formula for optimal bet sizing based on edge and odds. f = (bp - q) / b. Most pros use half or quarter Kelly to reduce variance.
Key Number: Common margins of victory. NFL: 3 and 7. NBA: none really. Crossing key numbers with the hook is worth 0.5-1 unit of EV.
KYC (Know Your Customer): Required ID verification to withdraw. Submit ID + address + sometimes source-of-funds. Standard at licensed books. Prevents money laundering.

L

Ladder Parlay: Rolling parlay where each leg stakes prior winnings. Big compounding upside, one miss wipes you. Emotional, rarely +EV.
Limit (Betting Limit): The max a book will take on a bet. Sharp books (Pinnacle, Circa) have high limits. Retail books limit winners fast.
Limited / Restricted: When a sportsbook cuts your max bet size. Usually happens to winners, arb players, or promo abusers. Spread action across books to avoid.
Live Betting (In-Game): Betting on odds that update in real time during the game. Higher variance, more edge opportunities for quick thinkers, but higher vig.
Live Dog: An underdog with a real chance to win, not just cover. Usually +150 to +300. Sharp dogs often go off at shorter prices by tip.
Lookahead Line: Line posted days in advance of a future game. Usually limited liability. Popular for injury-dependent futures bets.

M

Map Betting (Esports): Bet winner of specific map in a series. Knowing map pool + team specialties matters more than overall team strength.
Martingale: Doubling bet after every loss to recover. Math guarantees ruin with a finite bankroll. Do not use. Ever.
Matched Betting: Use free bets + promos at one book while covering the outcome at an exchange (Betfair, Smarkets) to lock in profit. UK staple, limited US presence.
Middle: Betting both sides at different spreads. If you have Team A -3 and Team B +5, you win both if Team A wins by exactly 4. Low risk, rare payoff.
MLB Total (O/U): Combined runs in game. 8.5-9.5 is typical. Wind (out = overs), ballpark, weather, and L/R pitcher splits all factor.
Model (Betting Model): Custom algorithm that projects game outcomes. Can be simple spreadsheet or ML model. Edge comes from data + inputs sportsbooks underweight.
Moneyline (ML): A bet on which team wins straight up. No spread involved. -150 means risk $150 to win $100. +150 means risk $100 to win $150.
MVP / Award Futures: Bets on individual player awards (MVP, ROY, DPOY, CY Young). Narrative-driven, often overreactive. Fade mid-season hype for better prices.

N

NCPG: National Council on Problem Gambling. 1-800-GAMBLER, 24/7 confidential hotline + text line. Your first call if gambling is a problem.
No-Sweat Bet: Book promo: lose your first bet, get stake back as bonus bets. Value is 35-50% of advertised amount depending on terms.
No-Vig Price (Fair Odds): The true probability-implied price with sportsbook juice stripped out. Use a devigger to find it. Compare your line to no-vig for EV.
NRFI (No Runs First Inning): MLB prop: no run scored in the 1st inning. YRFI = at least one run. Popular daily prop market.

O

Odds Boost: Sportsbook promotion giving enhanced odds on a specific bet. Always +EV if you would have bet it anyway at normal odds.
Opening Line: First posted odds. Often the softest line of the week. Sharps attack openers hard.
Outs Recorded: MLB pitcher prop: total outs. Proxy for innings pitched. Manager trust + pitch count limit = cap.
Over/Under (Total): A bet on the combined score of both teams. Over 48.5 means you think both teams will combine for 49+ points.

P

Pace of Play: NBA/NFL: possessions per game. High pace = more scoring opportunities = higher totals. Check opponent pace too.
Pari-Mutuel: Horse/greyhound betting pool where payouts are determined by final pool totals, not fixed odds. Track takes a % before payout.
Parlay: Combining 2+ bets into one. All legs must hit to win. Higher payout but much lower probability. The vig compounds per leg.
Passing Yards Prop: NFL QB prop: over/under pass yards. Key numbers: 250, 275, 300. Weather/pace inputs drive the line.
Percentage Betting: Staking a fixed % of current bankroll on each bet. Compounds wins faster, recovers from losses slower. Popular with pros.
PGA Tour Futures: Bet player to win tournament (outright), top 5, top 10, top 20, or make the cut. Outright odds = +800 to +20000 typical.
Pick Six: Horse bet: pick winner of 6 consecutive races. Pool rolls over if nobody wins. Jackpot can reach millions.
Pinnacle: Asian sharp book. No limits on winners. Lowest vig in the industry (1-2%). Unavailable in US. The gold standard for true prices.
Pivot Point: A number in the line where EV changes meaningfully. Crossing from +3 to +2.5 is a pivot in the NFL.
Player Props: Bets on individual player stat lines (points, yards, strikeouts). Weaker markets than game lines = more beatable.
Point Spread: The expected margin of victory. Favorites give points (-3.5), underdogs get points (+3.5). You bet whether the favorite wins by more than the spread.
Points Prop: NBA/NHL prop: over/under points (scoring points in NBA, total points in NHL). Most liquid prop market.
Power Rating: Numeric strength grade for each team. Used to project lines. Public power ratings: Sagarin, Massey, FPI.
Pregame: Bets placed before the opening tip/kickoff/first pitch. Most volume happens pregame. Sharper markets at close.
PrizePicks: Pick-em DFS operator. Pick 2-6 player props over/under, higher payout per correct pick. Popular entry point for beginners.
Promo / Promotion: Any book offer that adds value. Deposit match, odds boosts, no-sweat bets, profit boosts. Promo abuse is a legitimate edge for new users.
Promo Abuse (Bonus Hunting): Legitimate +EV strategy: systematically claim every sportsbook bonus, deposit match, and risk-free bet. Expected hourly: $50-$200 for first 3 months.
Prop Bet: A bet on a specific player/game stat, not the final outcome. Example: "Mahomes Over 285.5 passing yards." Player props are a growing market.
Public Bettors (The Public): Casual bettors. Typically bet favorites, overs, and popular teams. Fading the public is profitable in select spots, not always.
Puck Line (NHL): NHL spread equivalent: -1.5 or +1.5 goals. Favorite must win by 2+. Underdog wins or loses by 1. Popular alt to ML.
Push: When the result lands exactly on the spread/total. Your bet is returned (refunded). Nobody wins or loses.

Q

Quarter Bet: Bet on a single quarter spread/total. Higher variance. Line-makers spend less effort on quarters = soft market.

R

Rebounds Prop: NBA prop: over/under rebounds. Positional data (C vs G) matters. Pace and opponent defensive rebound rate are key.
Reduced Juice: Sportsbooks offering -105 instead of -110 on standard lines. Cuts vig from 4.55% to 2.38%. Default +EV book choice for volume bettors.
Referee Impact: NBA/Soccer: specific refs have different styles (loose vs tight). Check ref historicals for O/U totals and foul props.
Regression to the Mean: Hot streaks and cold streaks both regress over time. 80% weeks don't continue. Fade extreme hot streaks in player props.
Regular Season Markets: All stats props scoped to regular season only (unless stated). Postseason = separate market, different pricing.
Regulated (US): State-licensed sportsbook. Your funds are segregated + protected. Complaints go to state gaming commissions. Pays tax correctly.
Rest Advantage: Days off before game. NBA back-to-backs drop win% by 3-5 points. NFL short week (Thursday) favors home team by ~1 point.
Reverse Line Movement (RLM): Line moves opposite to public betting %. Classic sharp indicator. If 75% on favorite but line drops, sharps are on the dog.
Risk-Free Bet (Second-Chance): If your first bet loses, book refunds up to $X in free bets/site credit. Value is ~30-50% of advertised amount. Always +EV if bet sized right.
ROI (Return on Investment): Profit divided by total wagered. A 5% ROI over 1000+ bets is elite. Anything over 2% long-term beats most pros.
ROI Variance: Even good bettors have losing months. 52%-55% win rate doesnt mean winning every week. Drawdowns of 10-15 units are normal.
Rolling Parlay: Same as ladder. Stake initial amount, roll winnings into next leg until you cash or bust.
Round Robin: Auto-build every possible 2-team, 3-team, etc parlay from your selections. Cushions variance but doesn't beat vig.
Run Line (MLB): MLB spread equivalent: -1.5 or +1.5 runs. Favorite must win by 2+. Tight games = run line hits the dog.
Rushing Yards Prop: NFL RB prop: over/under rush yards. Injury to teammates drives volume upward. Check workload reports.

S

Sack Prop: NFL defensive prop: will player X record a sack. Extremely variance-heavy, rarely +EV.
Same Game: Parlay across multiple markets from ONE game (SGP). Books compound vig. Correlations (QB passing yards + WR receiving yards from same team) reduce payout further.
Same-Day Parlay: Multi-game parlay across same day slate. DK/FD push boosts often land on same-day parlays to move volume.
Sample Size: Number of bets needed before results mean something. 500 bets minimum to judge a model. 1000+ for real confidence.
Saves Prop: NHL/Soccer goalie prop: total saves. SOG faced x save % = projection. Good backups in starter's absence = sharp play.
Scamdicapper: A fake capper selling picks with no real edge, doctored results, or private Discord shilling. Verified track records matter.
Scheduled Rest / Load Management: NBA stars sitting healthy for rest. Usually telegraphed 24-48 hours out via ESPN reporters. Sharpen at drop.
Season Win Total: Over/under on total games a team wins in a season. NFL is 17 games max. Injuries, schedule, and coaching changes drive the line.
Selling Points: Moving the spread against you at better odds. Rare but worth considering on teasers/alt lines with strong models.
Set Betting (Tennis): Exact-score bet on set wins (2-0, 2-1 in WTA; 3-0, 3-1, 3-2 in ATP majors). Highest payout among tennis markets.
SGP (Same Game Parlay): A parlay where all legs are from the same game. Popular but correlated legs compound the vig even more than regular parlays.
SGP Parlay: Same as SGP. Same Game Parlay combining multiple correlated props from one game. Book's juice is compounded heavily.
SGP+ (Same Game Parlay Plus): Cross-game parlay with at least one SGP leg included. Newer market (2023+). More correlated = higher vig built in.
Sharp: A professional/winning bettor who uses data and analysis. Their bets move lines. Opposite of "square" (casual bettor).
Sharp Action: Volume from pros. Moves lines even at low ticket count because of size. Follow sharp books (Pinnacle, Circa) to see it.
Sharp Book: Pro-focused book. Lower vig, higher limits, takes size. Examples: Pinnacle (offshore), Circa (Vegas), some prop boutiques.
Shots on Target (Soccer): Prop: total shots forcing the keeper to save. Better proxy for goal threat than shots total. 3-4 per team average.
Shots Prop: NHL/Soccer prop: total shots taken. More reliable than goals (no goalie variance). Sharps love high-SOG games.
Slate: The full card of games for the day/weekend. "Sunday slate" = all NFL games that day. DFS uses slate terminology too.
Sleeper: Fantasy app that added DFS. Strong in season-long leagues, growing in DFS. Unique drafted pools.
Soft Book: Recreational-focused book. Square lines, square limits, limits winners fast. Best for promos but not volume. Examples: DK, FD, MGM.
SOG (Shots on Goal): NHL prop: total shots on goal in a game. High-variance prop with weak markets = beatable.
Square: A recreational/casual bettor. Tends to bet favorites, popular teams, and parlays. Opposite of "sharp."
Square Action: Betting volume from recreational players. Books price lines to attract square action on the wrong side.
Standard Deviation: Stat measure of how much ROI swings. Higher stddev = bigger bankroll needed. Parlays have huge stddev; flat ML bets have low stddev.
Starting Lineup: Confirmed starters. Late scratches in NBA (10pm ET) and MLB (first pitch) move lines 1-3 points.
State Launch: Date a new state goes live with online sports betting. First 30 days = promo gold rush. Most states: DK + FD go first.
Steam Move: When a line moves quickly due to heavy sharp action. "Steaming" a line means sharps are pounding it.
Stop Loss: Preset daily/weekly loss limit. When hit, stop betting. Critical for discipline and responsible gambling.
Strength of Schedule (SOS): Quality of opponents faced/remaining. Harder SOS = worse stats. Adjust player props and team totals accordingly.
Strikeouts Prop: MLB pitcher prop: total Ks. Opposing lineup K% + pitcher L/R splits drive it. Weather (wind in) increases Ks.
Sucker Bet: A bet with heavy vig disguised as attractive. Parlays over 3 legs, teasers at certain numbers, most boosts with fine print.
Superfecta: Horse bet: pick 1st-4th in exact order. High variance, high payout. Box = 24x cost.

T

Team Total: Over/under points scored by ONE team (not both). Useful when you like one side but not the other in a total.
Teaser: A parlay where you move the spread in your favor on each leg (usually 6-7 points in NFL). Lower payout but higher win probability.
Teaser Ties: NFL 6-point teaser: 3 to 9 crosses 3 and 7, key numbers. Wong teasers (favorites -7.5 to -8.5, dogs +1.5 to +2.5) historically +EV at specific books.
Threes Made Prop: NBA prop: 3-pointers made by a player. High variance. Volume shooters (Curry, Dame) = safer unders on bad nights.
Thunder / Props Cash: Secondary DFS-pickem operators. Weaker markets, beatable in some cases but watch for payout terms.
Tilt: Emotional decision-making after a loss. Chasing, doubling up, betting teams you don't usually bet. The #1 killer of bankrolls.
To Qualify (Soccer Cup): Two-legged tie: which team advances? Includes away-goal rule + extra time + penalties. Priced differently than 90-min ML.
Total Games (Tennis): Over/under total games played in the match. Heavy serve players + grass = overs. Clay + baseliners = unders.
Trifecta: Horse bet: pick 1st, 2nd, and 3rd in exact order. Box it for all 6 orderings at 6x cost.

U

Underdog Fantasy: DFS operator with Pick-em and Best Ball formats. Known for early-market props (often softer than traditional books).
Unit: A standardized bet size. Usually 1-5% of your bankroll. $1000 bankroll = $10-50 per unit. NEVER chase by increasing unit size.
Unit Size: The dollar amount of 1 unit. Keep it between 1-3% of bankroll for flat betting. Adjust using Kelly for high-edge plays.
Unregulated / Offshore: Non-licensed books (Bovada, BetOnline, MyBookie). No legal recourse if they dont pay. Crypto deposits common. Higher risk.

V

Variance: How results deviate from expected. High variance = big swings. Proper bankroll management survives variance; sloppy management dies.
VPN Detection: Books ban accounts caught using VPN to fake location. Real bans, seized funds, permanent. Do not VPN.

W

Weather Impact: Outdoor NFL/MLB games. Wind 15+ mph = unders. Rain = unders + rushing overs. Hot dome openers = unders early season.
Whale: A very high-volume bettor. Casinos love whales because variance on their play smooths. Distinct from sharps (whales can be -EV).
Wiseguy: Slang for a sharp/pro bettor. Used by sportsbooks internally. Wiseguy account = account flagged for high limits.