In limit poker, the larger bet size in the late betting rounds, as opposed to the half-sized bets earlier. See small bet.
In a fixed limit game where the limit is higher in later rounds than in early rounds, the higher amount is called a "big bet". That $10-$20 game looked good, but I only had 8 big bets in my pocket at the time.
The larger of the two betting increments in a limit game.