1. To express approval, especially by clapping: applaud, cheer, root2. Idioms: give someone a hand. SeePRAISE. 2. To strike, set down, or close in such a way as to make a loud noise: bang, crash, slam, whack. SeeSOUNDS. 3. To make a sudden sharp, explosive noise: bang, bark, crack, pop1, snap. SeeSOUNDS.