1. A joint of a finger; any of the joints connecting the metacarpal bones to the proximal phalanges of the fingers
   "Cracking your knuckles is a common habit for some people";
   - knuckle joint, metacarpophalangeal joint

1. Press or rub with the knuckles
   "He knuckled his eyes sleepily"
    
2. Shoot a marble while keeping one's knuckles on the ground
   "The boy knuckled his shooter marble with precision"

Derived forms: knuckled, knuckles, knuckling

Type of: articulatio synovialis, diarthrosis, press, shoot, synovial joint

Part of: finger

Encyclopedia: Knuckle, Robert