Definition of clap:
(n) :
the act of
striking the palms of the hands, or any two surfaces, together; the sound produced thereby; any loud, sudden, explosive sound resembling that made by striking one hard
surface on another
"he summoned the waiter with a clap."
(v) :
to
strike the palms of the hands together, creating a sharp sound; to
applaud
"the children began to clap in time with the music."