Definition of knuckleduster noun from the Oxford Advanced Learner's Dictionary

 

knuckleduster

 noun
noun
BrE BrE//ˈnʌkldʌstə(r)//
 
; NAmE NAmE//ˈnʌkldʌstər//
 
(North American English also brass knuckles)
 
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a metal cover that is put on the fingers and used as a weapon
See the Oxford Advanced American Dictionary entry: knuckleduster