knuckle (n.)

  1. a joint of a finger when the fist is closed

    [ Syn: knuckle joint , metacarpophalangeal joint ]

    knuckle (v.)

  1. press or rub with the knuckles

  2. shoot a marble while keeping one's knuckles on the ground

The dictionary is based on the WordNet Electronic Lexical Database.
WordNet 3.0 Copyright 2011 by Princeton University. All rights reserved.