An idiot; a stupid or inept person.

plural of knucklebone

A children's game, originally played with the knucklebones of sheep, in which small objects are picked up, moved, thrown, and caught according to various rules.

plural of knucklehead

plural of knuckle

Third-person singular simple present indicative form of knuckle

A weapon consisting of a metal reinforcement for the clenched fist, with finger holes molded in.

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

plural of knuckleball

(idiomatic) Causing fear, excitement, apprehension, suspense, or nervousness.