Limp

betting

Calling the big blind preflop instead of raising.

Open-limping is a leak in 99% of situations. Always raise or fold; the limp gives the BB a free flop and the hand has no preflop fold equity.

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.