(transitive) To apply pressure, or rub or massage with one's knuckles. / (transitive, slang) To strike or punch. / (intransitive) To bend the fingers.

Any of the joints between the phalanges of the fingers. / (by extension) A mechanical joint. / A cut of meat.

(US, archaic) A nickname for a man employed for his fistfighting skill.

plural of knuckle

Third-person singular simple present indicative form of knuckle

(chiefly in combination) Having a certain type of knuckles.

simple past tense and past participle of knuckle

Synonym of knuckle under

present participle of knuckle

(Britain, informal) Risqué, sexual, suggestive of impropriety.