Sports Betting Glossary

Any bet or wager placed on a sporting event. 'Having action' means you have money riding on a game.

A bet where you're betting on the point spread rather than the straight moneyline. Your team must cover the spread to win.

Odds format used in the US showing plus (+) or minus (-) numbers. Minus indicates the favorite (how much to bet to win $100), plus shows the underdog (how much you win on a $100 bet).

UK term for a parlay. Multiple selections combined into one bet where all picks must win.

Betting on all outcomes across different sportsbooks to guarantee a profit regardless of result. Also called 'arbing' or 'sure bets'.

The total amount of money you have set aside specifically for betting. Proper bankroll management is key to long-term success.

A wager placed on the outcome of a sporting event or market.

A person who places bets on sporting events. Also called a 'punter' in the UK.

Short for sportsbook. A company or individual that accepts bets on sporting events.

The person or company that sets the odds and accepts bets. Also called a 'bookie' or 'oddsmaker'.

A loss that occurs due to unlikely or last-second events that were not expected based on the game flow.

The final odds available before a game starts. Beating the closing line consistently is a sign of a sharp bettor.

Increasing bet sizes to recoup losses. Generally considered poor bankroll management.

Measuring if your bet beat the closing line. Consistently positive CLV indicates a winning long-term strategy.

Betting against the public, particularly when heavy action on one side moves lines. Based on the idea that the public is often wrong.

When a team wins by more than the point spread (if favored) or loses by less than the spread (if underdog).

Odds format common in Europe showing total return. A 2.50 line means a $100 bet returns $250 total ($150 profit).

A bet with odds of +100/-100 where you win the same amount you wager. Also called 'pick'em' for spreads.

An advantage over the sportsbook. Having an 'edge' means your expected win rate exceeds the implied probability of the odds.

The average amount you expect to win or lose per bet over the long run. Positive EV (+EV) bets are mathematically profitable.

The team or player expected to win, indicated by minus (-) odds on the moneyline.

Odds format common in UK (e.g., 5/1 means you win $5 for every $1 bet). The left number is profit, right is the stake.

Bets placed on events happening in the future, like who will win the Super Bowl or MVP award.

To bet against someone or something. 'Fading the public' means betting opposite to where most money is going.

Someone who analyzes sporting events to predict outcomes and find betting value.

Placing additional bets to reduce risk or lock in profit on an existing wager.

A half-point in the point spread (e.g., 3.5 or 7.5). Eliminates the possibility of a push.

A conditional bet where the second wager only happens if the first bet wins.

Placing bets during a live sporting event. Also called 'live betting'. Odds change in real-time based on game action.

Converting odds to probability. -200 implies 66.7% win chance. Useful for comparing your model's probability to market odds.

The commission the sportsbook takes on bets, typically 10%. Also called 'vigorish' or 'vig'. A -110 line means betting $110 to win $100.

A mathematical formula for optimal bet sizing based on your edge and bankroll. Many pros use 'Half-Kelly' for safety.

The odds or point spread set by the sportsbook for a particular game.

When odds change between opening and closing due to betting action, injuries, or other factors. Tracking line movement reveals where 'sharp money' is going.

Comparing odds across multiple sportsbooks to find the best price. Essential for maximizing long-term profits.

The maximum amount a sportsbook will accept on a single bet. Sharp bettors often face lower limits.

A bet that's supposedly guaranteed to win. (Spoiler: true locks don't exist, use with caution.)

A straight bet on which team will win without any point spread. Odds indicate the payout for picking the winner.

When you bet both sides at different spreads and both bets win if the final score lands between them.

Running thousands of random simulations to estimate probability distributions for game outcomes. Used by GameChampAI for predictions.

The first odds posted by sportsbooks before betting begins. Comparing to closing line shows market movement.

A single bet combining multiple selections. All picks must win for the parlay to pay. Higher risk, higher reward.

Bets on individual player performance (e.g., 'LeBron over 28.5 points'). Also called 'player proposition bets'.

A handicap given to the underdog to level the playing field. The favorite must win by more than the spread.

A bet on a specific occurrence within a game, not directly tied to the final score (e.g., 'first player to score').

A tie between bettor and sportsbook, usually when the final margin equals the spread exactly. Stake is returned.

A series of parlays created from multiple selections. Provides some protection if one leg loses.

The tendency for extreme performance to move toward average over time. Teams on hot or cold streaks often regress.

Profit divided by total amount wagered, expressed as a percentage. A 5% ROI means $5 profit per $100 bet.

A parlay combining multiple bets from the same game. Popular for combining player props with game outcomes.

A single wager on one game or event, either against the spread or on the moneyline.

A professional or highly skilled bettor who consistently beats the market. 'Sharp money' moves lines.

A casual or recreational bettor who typically bets on favorites and popular teams.

Rapid, significant line movement caused by heavy betting action, usually from sharps or syndicates.

A modified parlay where you move the point spread in your favor on multiple games, but all legs must still win.

A bet on whether the combined score of both teams will be over or under a number set by the sportsbook.

Your betting slip or confirmation showing the details of your wager.

The actual probability of an outcome occurring, before sportsbook margin is applied.

The team or player expected to lose, indicated by plus (+) odds on the moneyline.

A standardized bet size relative to your bankroll. If your bankroll is $1,000 and you bet 1%, your unit is $10.

The commission charged by sportsbooks on losing bets, typically around 10%. Also called 'juice' or 'the cut'.

When odds offered are better than the true probability suggests. Finding 'value' is the core of profitable betting.

When a bet is cancelled and the stake is returned. Common when players are scratched or games postponed.

Percentage of bets won. A 55% win rate on -110 odds is profitable. Higher rates are needed for worse odds.