Etymology
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frap (v.)

"to strike, smite," early 14c., from Old French fraper "to strike, hit, beat," in nautical use "fix, fasten" (12c., Modern French frapper), cognate with Italian frappare "to strike," which is of unknown origin, perhaps imitative (compare rap (n.)). Nautical sense of "bind tightly" is from 1540s. Related: Frapped; frapping.

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Definitions of frap

frap (v.)
make secure by lashing;
frap a sail
frap (v.)
take up the slack of;
frap a rope
From wordnet.princeton.edu