Betting Glossary

A reference glossary of betting terminology — odds, markets, bet types, value and bonus terms, defined precisely.

Odds & Fundamentals

Action

Any wager placed on a sporting event; also a status flag confirming a bet is live and valid.

Against the Spread (ATS)

A team's record measured against the point spread rather than the outright game result.

Bad Beat

A wager that looks all but certain to win yet loses to a last-minute or highly improbable event.

Cover

A team covers when its result clears the point spread — the favorite wins by enough, or the underdog stays close enough.

Even Money

A wager whose potential profit equals the stake: decimal 2.00, fractional 1/1, American +100.

Favorite vs Underdog

The favorite is expected to win and carries a shorter price; the underdog is expected to lose and carries a longer price.

Hook

The half-point attached to a spread or total (e.g., -3.5 rather than -3) that removes any chance of a push.

Implied Probability

The likelihood of an outcome derived from the betting odds, with the bookmaker's margin baked in.

Juice / Vigorish (Vig)

The bookmaker's commission on each wager, embedded directly in the odds rather than charged separately.

Moneyline

A wager on which team or player wins the contest outright, with no point spread applied.

No Action

A wager that is voided with the stake refunded, typically after a postponed event, a scratched player, or invalidated conditions.

Odds Formats

The three standard notations for displaying odds: Decimal, Fractional, and American (Moneyline), each encoding identical probability and payout data.

Off the Board

A game or market the sportsbook has temporarily pulled from betting, typically because of uncertainty such as injuries or weather.

Over/Under (Totals)

A wager on whether the combined score of a game will finish over or under a posted number.

Pick'em

A matchup with no favorite -- the spread sits at zero, so the bet reduces to picking the outright winner.

Point Spread

A handicap applied to equalize the wagering proposition between favorite and underdog.

Push

A bet that ties exactly against the spread or total, returning the full stake to the bettor with no profit or loss.

Straight Bet

A single-selection wager on one market -- moneyline, point spread, or total -- rather than a parlay or combined ticket.

Bet Types

Asian Handicap

A soccer spread format that removes the draw by applying fractional or whole-number handicaps to one or both teams.

Cash Out

A mechanism for settling a wager before the event ends, letting you secure profit or cap a loss based on live probability.

Double Chance

A soccer wager covering two of three results (home/draw, away/draw, or home/away) — lower variance traded for lower odds.

Futures Bet

A wager on an outcome that resolves later, such as a league championship or a tournament winner decided over a full season.

Hedging

Placing a wager on the opposite side of an open position to lock in profit or cap loss regardless of how the event resolves.

Live Betting (In-Play)

Wagering on an event already underway, with odds recalculated in real time as the game develops.

Parlay (Accumulator)

One wager chaining two or more selections, where every leg must win for the ticket to pay.

Player Prop vs Game Prop

Player props price individual performance (e.g., passing yards); game props price team or match events (e.g., first team to score).

Prop Bet (Proposition Bet)

A wager on a specific in-game occurrence or statistic that need not correlate with the final result of the contest.

Round Robin

A combination wager that generates multiple smaller parlays from a set of selections, covering every subset of a chosen size.

Run Line / Puck Line

A sport-specific spread — a fixed 1.5-run line in MLB baseball and a fixed 1.5-goal puck line in NHL hockey.

Same-Game Parlay

A parlay in which every selection is sourced from a single game or event.

Teaser

A parlay variant that lets the bettor shift each leg's spread or total in their favor in exchange for a lower payout.

Value & Strategy

Arbitrage Betting

Staking every possible outcome across separate bookmakers to lock in a guaranteed profit no matter the result.

Bankroll

The capital a bettor allocates strictly for wagering, isolated from personal finances and used as the basis for all stake sizing.

Buying Points

Paying worse odds in exchange for a more favorable spread or total, commonly to move across key football numbers like 3 and 7.

Closing Line Value (CLV)

The gap between the odds you secured and the final closing odds, a data-driven gauge of betting skill.

Edge

A measurable advantage over the book, present when your estimated true probability exceeds the probability implied by the posted odds.

Expected Value (EV)

The average per-bet result a bettor should expect to win or lose across a large sample.

Fade the Public (Contrarian Betting)

Betting against the side most recreational bettors favor, on the theory that public sentiment distorts the line and creates value on the opposite side.

Kelly Criterion

A formula that computes the optimal stake size from your estimated edge and bankroll to maximize long-run growth.

Key Numbers

The most frequent victory margins in a sport, which give certain point spreads outsized importance over others.

Line Shopping

Comparing odds across several books to lock in the best available price on a given bet.

Matched Betting

A method that pairs sportsbook promotions (bonus bets, odds boosts) with opposing wagers to extract a near risk-free, mathematically locked profit.

Middling

Wagering both sides of a game at separate point spreads, targeting a final margin that lands inside the gap so both bets cash.

ROI (Return on Investment)

Net profit or loss expressed as a percentage of total money wagered.

Steam Move

An abrupt, sharp line shift triggered by heavy action from professional bettors or syndicates.

Tout

A person or service that sells betting picks, frequently backed by inflated or unverifiable success-rate claims.

Units

A normalized measure of bet size relative to bankroll, used to track and compare results independent of actual dollar figures.

Variance (in Betting)

The natural fluctuation in results that occurs even across a series of positive expected value bets.

Market Terms

Betting Handle

The aggregate dollar volume wagered on a given event or across a defined reporting period.

Betting Limits

The minimum and maximum stake a bookmaker will accept on a single wager.

Chalk

Market slang for the favorite in a matchup; 'betting the chalk' means backing the side the odds project to win.

Line Movement

A shift in odds or point spread after the opening number posts, triggered by betting action, injuries, weather, or new data.

Oddsmaker / Bookmaker

The individual or firm that prices betting lines, manages exposure, and accepts wagers on sporting events.

Opening Line / Closing Line

The opening line is the first set of odds posted; the closing line is the final price before the event starts.

Public Betting Percentage

The share of total tickets placed on each side of a market, quantifying where the recreational majority has wagered.

Reverse Line Movement

When a line moves against the side holding most public bets, signaling that sharp money is weighting the opposite outcome.

Sharp vs Square

Sharps are professionals betting with a quantifiable edge; squares are recreational bettors who generally track public sentiment.

Stale Line

Odds not yet updated for new information such as injuries or lineup changes, opening a value window for alert bettors.