Sports Betting Glossary
Plain-English definitions for every term you will see on a sportsbook, a pick embed, or a capper breakdown. Reference material for the /glossary bot command and the /docs/glossary web page.
18+ only. Gambling involves risk of loss. Not financial advice. If you or someone you know has a gambling problem, call 1-800-GAMBLER.
A
Action: A bet, or the volume of betting on a market. "Taking action" means placing a bet.
Against the Spread (ATS): How a team performs after the point spread is applied. A 10-0 team may be 3-7 ATS if it was favored to win by larger margins than it actually did.
Alt Line: An alternate version of a standard market (alt spread, alt total, alt player prop) with different odds. Useful for finding value when the main line is softly priced.
American Odds: Odds format using + or - (+150, -110). Negative numbers show how much you must risk to win $100. Positive numbers show how much you win on a $100 risk.
Arbitrage (Arb): Placing bets on every outcome of an event across different books to lock in a profit regardless of result. Books ban or limit arb players.
Asian Handicap: Alternative spread format used heavily in soccer. Eliminates draw outcome by handicapping one side.
B
Backdoor Cover: When a trailing team scores late in a game that does not change the winner but covers the spread, usually via garbage-time play.
Bankroll: The total money set aside for sports betting. Should be money you can afford to lose entirely.
Bet Slip: The ticket that records the details of your wager before you place it.
Book (Sportsbook): The operator taking bets. DraftKings, FanDuel, BetMGM, Caesars, Circa, Pinnacle, and Fanatics are the major US books.
Buying Points: Paying worse odds in exchange for a more favorable spread or total. Usually a bad value trade.
C
Cash Out: Settling a bet before the event ends for an amount the book offers. Book holds extra value on most cash-out offers.
Chalk: The betting favorite. "Chalk bettor" usually means someone who mostly bets favorites.
Circle Game: A game where bookmakers have reduced limits due to injury, weather, or information imbalance.
Closing Line: The final line a book offers before an event starts. Widely used as the fairest reflection of true probability.
Closing Line Value (CLV): The difference between the odds you got and the closing odds. Positive CLV over time correlates strongly with profitable betting.
Combo Bet: Same as a parlay outside the US.
Correlated Parlay: A parlay where legs are statistically related (same QB over passing yards + WR1 over receiving yards). Most books ban correlated legs in SGPs, some allow them.
Cover: To beat the spread.
D
Dead Heat: A tie in a prop or futures market that the book settles with reduced odds across winners.
Dime: $1,000. "A dime bet" is $1,000.
Dog (Underdog): The team expected to lose. Plus odds on the moneyline.
Draw No Bet: Soccer market that pushes if the match ends in a tie.
E
Edge: The percentage advantage your true probability has over the book's implied probability. 1-3% edge is elite.
EV (Expected Value): Expected long-run return on a bet. Positive EV bets are profitable in the long run even if they lose often.
Even Money: Odds of +100 (or 2.00 decimal). Risk $100 to win $100.
Exotic: Any non-standard bet. Futures, props, parlays, teasers all count.
F
Fade: To bet against. "Fade the public" means bet opposite of where recreational money is flowing.
Favorite: The team expected to win. Minus odds on the moneyline.
First Half (1H): Bet lines specific to the first half of a game.
Fractional Odds: Odds format using fractions (5/1, 7/2). Common in the UK and horse racing.
Futures: A bet on an event that will resolve later in the season (Super Bowl winner, NBA MVP, league-wide leader).
G
Grand Salami: A single bet on the total goals or runs across every game on a league's slate that day.
Grinder: A bettor who makes many small wagers trying to accumulate steady profit.
H
Halftime Bet: A line posted during halftime that bets only on the second half result.
Handicap: The point spread in soccer, or the general concept of handicapping a matchup.
Hedge: Placing an opposite-side bet to reduce risk on an earlier bet. Usually done on live games or futures.
Hold (Vig, Juice, Overround): The book's built-in margin across a market. 4-5% is common on spread / total, 5-7% on props, 1-2% at reduced-vig books like Pinnacle and Circa.
Hook: Half a point on a spread or total (3.5, 7.5). "Buying the hook" means paying to move off the key number.
I
Implied Probability: The probability a given odds price implies. -110 implies 52.4% win rate to break even.
In-Play (Live) Betting: Betting on a game while it is happening. Odds change every play.
J
Juice (Vig): The book's cut built into odds. -110 on both sides is a 4.5% juice. Lower juice books like Pinnacle and Circa pay more per unit bet.
K
Kelly Criterion: A bet-sizing formula that maximizes long-run bankroll growth based on edge and odds. Full Kelly is aggressive; most bettors use Half or Quarter Kelly to reduce variance.
L
Lay: Taking the opposite side. On betting exchanges you can lay a team (bet they lose).
Limits: Maximum accepted stake on a given market. Sharp books post higher limits; soft books cut limits aggressively on winning players.
Line: The odds, spread, total, or price a book is offering.
Line Movement: A change in the odds between open and close. Sharp movement is caused by informed money.
Line Shopping: Checking multiple books for the best available price before placing a bet. The single highest-ROI habit for a sharp bettor.
Live Betting: See In-Play Betting.
Lock: A pick advertised as a guaranteed winner. There is no such thing. Fade anyone selling locks.
Long Shot: A large underdog with big plus odds.
M
Middle: A scenario where both legs of a two-sided bet can hit. Rare but profitable when found.
Matched Betting: Using sportsbook promos against yourself to lock in a guaranteed profit. Legal in most jurisdictions but often bonus-abuse policy-blocked.
Moneyline (ML): A straight bet on which team wins, no spread involved. Priced with American odds.
N
No Action: A bet that is voided and refunded, usually due to postponement or a rule trigger.
Novelty Bet: A non-sports market (Oscars, election, reality TV). Legal in some jurisdictions, not others.
O
Odds Boost: A promotional price on a market that is better than market consensus. Usually a book loss-leader to attract sign-ups.
Off the Board: A market that is not currently accepting bets, usually due to injury news.
Opening Line: The first line a book posts for an event.
Over / Under: A bet on whether the total combined score will be above or below a given number.
Overlay: A bet where true probability exceeds implied probability. The bettor has an edge.
Overround: Another word for juice / hold.
P
Parlay: A single ticket combining multiple legs. All legs must win. Pays more than the sum of individual legs, at the cost of stacked book hold.
Pick'em (PK): A game where neither team is favored by the spread.
Player Prop: A bet on an individual player's stat line (points, rebounds, passing yards).
Point Spread (Spread): The handicap added to one side to balance the market. Lakers -6.5 means the Lakers must win by 7 or more to cover.
Push: A tie with the line. Stake is returned. Common when betting a whole-number spread or total.
Q
Quarter-Kelly: Staking 25% of the full Kelly-recommended bet size. Reduces variance sharply while capturing most growth. The default in NuroBets /picks and /potd.
R
ROI (Return on Investment): Profit divided by total risked, usually shown as a percentage. 5%+ sustained is professional-level.
Reverse Line Movement (RLM): When the betting line moves opposite the public money percentage. Strong sharp signal.
Round Robin: A parlay that covers multiple combinations of a pool of legs. You pick 4 legs, the book creates all 2-, 3-, and 4-leg parlay combos.
Runline: MLB spread, typically set at 1.5 runs.
S
Same Game Parlay (SGP): A parlay where all legs come from one game. Books price these with heavy juice because of correlation risk.
Sharp: A winning professional bettor. Also used to describe well-balanced books (Pinnacle, Circa).
Side: One team's price on a spread or moneyline.
Square: A casual recreational bettor. Books make most of their margin from squares.
Steam Move: A sudden, coordinated line change across multiple books. Signals heavy sharp action.
Straight Bet: A single-leg wager. Opposite of a parlay.
Sucker Bet: A bet with very poor EV, often dressed up to look attractive (big parlays, long-shot props with hidden vig).
T
Teaser: A parlay variant where you adjust spreads or totals in your favor at worse odds. Common NFL teaser: 6-point teaser through key numbers 3 and 7.
Total (Over / Under): See Over / Under.
True Odds: The fair odds reflecting the actual probability of an event. Opposite of book odds, which include juice.
U
Underdog: See Dog.
Unit: A standardized bet size. 1 unit is typically 1-2% of bankroll. Tracking ROI in units normalizes across bettors.
V
Variance: The short-term swings in results that happen even with a winning strategy. Good process sometimes loses for long stretches.
Vig (Vigorish): See Juice.
W
Wiseguy: Slang for a sharp bettor.
Wager: A bet. Any placed action on a market.
Win Total: A season-long futures market on how many games a team will win.
X / Y / Z
XP: Experience points inside the NuroBets Discord. Earned from picks, quiz modules, and daily claims. Unlocks badges and tier perks.
Yield: ROI expressed as profit per unit staked, often used by European tipsters. Same idea as ROI.
Zeroed Out: A book closing your account or reducing limits to near zero, usually because you are beating them.
Market shorthand quick reference
- ML moneyline | PL puck line | RL runline | SP spread
- TT team total | FH / SH first half / second half
- SGP same game parlay | RR round robin
- YRFI / NRFI yes / no run first inning (MLB)
- F5 first five innings (MLB) | 1H / 2H first / second half
- O / U over / under | PK pick'em
- CLV closing line value | ATS against the spread | DVOA defense-adjusted value over average
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