Also found in: Thesaurus, Encyclopedia, Wikipedia.
Related to knuckle-duster: brass knuckles
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Law) (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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
(used with a pl. v.) a band of metal with four holes that fits over the upper fingers and is gripped when a fist is made, used as a weapon.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.