Definition of knuckle
- knuckle Noun Any of the joints between the phalanges of the fingers.
- knuckle Noun A mechanical joint.
- knuckle Noun A cut of meat.
- knuckle Noun The curved part of the cushion at the entrance to the pockets on a cue sports table.
- knuckle Verb To apply pressure, or rub or massage with one's knuckles.