Definitions from Wiktionary (rap someone's knuckles)

▸ verb:  (literally) to tap one's knuckles on an object such as a desk or wall to attract attention or as a signal of commmunication.
▸ verb:  (somewhat dated, idiomatic) to give someone a punishment.
▸ verb:  (archaic, literally) to strike someone on the back of the hand usually as a method of punishment.


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