Definition of clap

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clap >

clap¹    (klp) KEY 

VERB:
clapped, clap·ping, claps
VERB:
intr.

1. To strike the palms of the hands together with a sudden explosive sound, as in applauding.
2. To come together suddenly with a sharp sound.

VERB:
tr.

1. To strike together with a sharp sound, as one hard surface on another: clapped a book on the desk.
2. To strike (the hands) together with an abrupt, loud sound, usually repeatedly: clapped hands in time to the music.
3. To strike lightly but firmly with the open hand, as in greeting: clapped me on the shoulder.
4. To put or place quickly and firmly: clapped the purse snatcher in jail; clapped a lid on the box.
5. To arrange hastily: clapped together a plan.

NOUN:

1. The act or sound of clapping the hands.
2. A sudden, loud, explosive sound: a clap of thunder.
3. A sharp blow with the open hand; a slap.
4. Obsolete A sudden stroke of fortune, especially of bad luck.

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ETYMOLOGY:
Middle English clappen, from Old English clæppan, clappian, to throb,, and from Old Norse klappa, to clap, pat