CLAP' Applaud (for) is a term that is used to express approval or admiration for someone or something. It is derived from the ROOT word 'CLAP, ' which is a four-letter word. Clapping is a gesture of appreciation, and when done in unison, it is known as applauding. Applauding is often done in public settings, such as at concerts, plays, or sporting events, to show support and appreciation for the performers.