Alternative form of bare-knuckling

present participle of white-knuckle

(baseball) A pitch thrown with the ball gripped on the fingertips and released with no rotation, which travels over an unpredictable path to the plate due to micro-turbulence in the air.

(intransitive, baseball) To pitch knuckleballs.

(baseball slang) A knuckleball.

Alternative spelling of knuckle duster

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