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Lock

A bet that is considered a sure winner, though no bet is ever truly guaranteed. The term is commonly used by tipsters and recreational bettors to express high confidence. Sharp bettors are skeptical of 'locks' because they understand that uncertainty is inherent in all sports outcomes.

Related General Terms

Stake
The amount of money a bettor risks on a single wager. Proper stake sizing is a critical component of bankroll management. Most professional bettors recommend risking between 1% and 5% of your total bankroll on any single bet to minimize the risk of ruin.
Punter
A common British and Australian term for a person who places bets, particularly on horse racing and sports. In the US, the equivalent term is typically 'bettor' or 'gambler'. The term is used casually and does not imply any particular skill level.
Accumulator (Acca)
A single bet that combines multiple selections into one wager. All selections must win for the bet to pay out. The odds multiply together, creating potentially large returns from small stakes, but the risk increases with each added selection.
Opening Line
The first odds offered by a bookmaker for a specific event or market. Opening lines are typically released several days before an event and move based on betting action, news, and other factors. Sharp bettors often look for value in opening lines before the market corrects.
Odds
A numerical representation of the likelihood of an outcome and the potential return on a bet. Odds can be displayed in decimal (2.50), fractional (3/2), or American (+150) format. Higher odds indicate a less likely outcome but a larger potential payout.
Bookmaker (Bookie)
A company or individual that accepts and pays out bets on sporting and other events. Bookmakers set the odds, manage risk, and build in a margin (overround) to ensure long-term profitability. Examples include Bet365, DraftKings, and FanDuel.
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