Cap in poker primarily refers to the limit of the overall number of raises that can be made in a betting round, although it can also mean the maximum amount you can bet or raise in a single action. Generally, casinos will set the cap at one bet and three or four raises.
Additionally, a cap can be the top buy-in limit. The buy-in cap helps control the size of the game and protects players who can’t afford to up the limits.
Cap Poker Example:
Let’s say you opened the betting for $10. The player in the Lojack seat raised, after which the player in the Hijack seat re-raised. As the action comes to you, you decide to re-raise as well and cap the betting at the maximum allowed three raises.