noun

1. Any of the joints between the phalanges of the fingers.

2. (by extension) A mechanical joint.

3. A cut of meat.

verb

1. To apply pressure, or rub or massage with one's knuckles.

   “He knuckled the sleep from his eyes.”

2. To bend the fingers.

3. To touch one's forehead as a mark of respect.

Synonyms: knuckle under