Etymology
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knap (v.)

"to strike with a sharp sound," late 15c., echoic. Earlier (c. 1400) as a noun meaning "abrupt stroke." Especially "to chip or break by a sharp blow" (1530s), the sense shifting from the sound to the act that makes it. Especially of the method of sharpening flints from 1862. Related: Knapped; knapper; knapping. For pronunciation, see kn-.

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Definitions of knap

knap (v.)
strike sharply;
Synonyms: rap
knap (v.)
break a small piece off from;
Synonyms: chip / cut off / break off
From wordnet.princeton.edu