Open

betting

The first preflop raise after the blinds.

Standard sizes: 2.5–3x BB online 6-max, 2.2x at higher stakes. Opening ranges depend heavily on position.

See also

All-In
Betting all your remaining chips.
Ante
A forced bet all players must post before each hand.
Barrel
A continuation bet on a later street (double = flop+turn, triple = + river).
Blind
A forced bet posted before the cards are dealt.