knuckles knuckles /ˈnʌkəlz/

noun

1. (used in the plural) a small metal weapon; worn over the knuckles on the back of the hand  ( brass knuckles , brass knucks , knuckles , knuckle duster , knucks )
   (used in the plural) a small metal weapon; worn over the knuckles on the back of the hand
    The gang member was found in possession of a knuckle duster, leading to his arrest.
   The gang member was found in possession of a knuckle duster, leading to his arrest.
   
   

 knuckle knuckle /ˈnʌkəl/

noun

1. () A joint of a finger when the fist is closed  ( knuckle joint , metacarpophalangeal joint , knuckle )
   a joint of a finger when the fist is closed
    He cracked his knuckles before sitting down to work on his computer
   He cracked his knuckles before sitting down to work on his computer
   
   

verb

1. Shoot a marble while keeping one's knuckles on the ground  ( knuckle )
   shoot a marble while keeping one's knuckles on the ground
   
2. Press or rub with the knuckles  ( knuckle )
   press or rub with the knuckles