A metal chain or a set of rings attached to a bar that can be fitted over the fingers to increase the impact of a blow with the fist.(noun-plural)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "brass knuckles" in a sentence
"One was a swell minis-try ruffian, a genteel lantern-jaw with a flowered weskit and brass knuckles in his fob, no doubt; the other was your complete politico, with the pudding face of a bad-tempered baby and no nonsense."
"He had looked like an Ivy League gentleman, but he had always carried a switchblade in one pocket and brass knuckles in the other."
"Dudley stepped in front of the three, his suitcoat open, .45 automatic, sap and brass knuckles in plain view."