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knuckle-duster

[ nuhk-uhl-duhs-ter ]

knuckle-duster

noun

  1. often plural a metal bar fitted over the knuckles, often with holes for the fingers, for inflicting injury by a blow with the fist
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of knuckle-duster1

An Americanism dating back to 1855–60

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