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Definitions from the Web

Knuckle

Noun (Anatomy)

A knuckle is a joint in the finger where the finger bone and the hand bone meet.

Example sentence: He clenched his fists, his knuckles turning white with anger.

Noun (Informal)

Informally, knuckle refers to the joint formed when the finger is bent, especially for the purpose of knocking on a surface.

Example sentence: He rapped his knuckles on the door to get her attention.

Verb

As a verb, knuckle means to press or rub the knuckles against something.

Example sentence: She knuckled her forehead, trying to recall the forgotten memory.

Adjective

Used as an adjective, knuckle indicates something that is rough, tough, or coarse.

Example sentence: The knuckle surface of the leather provides a unique texture.