knuckle
1. [ noun ] (anatomy) a joint of a finger when the fist is closed
Synonyms: metacarpophalangeal_joint knuckle_joint
Related terms: joint synovial_joint finger
2. [ verb ] press or rub with the knuckles
Related terms: press
3. [ verb ] (sport) shoot a marble while keeping one's knuckles on the ground
Related terms: shoot
Similar spelling:   knuckles
  knuckler
  Knicely
  Knisley