knuckle

Noun
  1. A joint of a finger when the fist is closed (synset 105592855)
    is a type of: articulatio synovialis, diarthrosis, synovial joint - a joint so articulated as to move freely
    is a part of: finger - any of the terminal members of the hand (sometimes excepting the thumb)
    same as: knuckle joint, metacarpophalangeal joint
Verb
  1. Press or rub with the knuckles (synset 201608212)
    is a type of: press - exert pressure or force to or upon
  2. Shoot a marble while keeping one's knuckles on the ground (synset 201608090)
    is a type of: shoot - throw or propel in a specific direction or towards a specific objective

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