Cap
A cap is a limit, such as on the number of raises in a betting round.
The simple explanation
A cap is a limit. In betting it usually means the largest number of bets and raises allowed in a round. In a limit game, the cap is often one bet and three raises. After the cap, no more raising is allowed, and players can only call or fold.
A closer look
In most casinos the cap is lifted when only two players remain in the pot. The word is also used for a maximum buy-in in a cash game, for example a $400 cap at a $2/$3 table, and for the largest amount a player can lose in a pot. Rules vary between rooms, so check how the cap works in the game you play.
A practical example
A game allows a bet and three raises. After the fourth bet, the betting is capped.
Full explanation
A cap is a limit, such as on the number of raises in a betting round.
A cap is a limit on the number of raises allowed in a betting round. Typically it is three or four raises, in addition to the opening bet.
Once the betting is capped, nobody can raise any more. Players who have not yet acted may call or fold.
In many casinos the cap is removed when only two players remain, so that heads-up pots can continue to be raised.
The word also appears as a limit on buy-ins, as in a game with a cap of $400.