brass knucks

English Thesaurus

1. a small metal weapon; worn over the knuckles on the back of the hand (noun.artifact)

hypernym	:	arm, weapon, weapon system,
definition	:	any instrument or instrumentality used in fighting or hunting (noun.artifact)

domain usage	:	plural, plural form,
definition	:	the form of a word that is used to denote more than one (noun.communication)