safety catch

English Thesaurus

1. guard consisting of a locking device that prevents a weapon from being fired (noun.artifact)

hypernym	:	guard, safety, safety device,
definition	:	a device designed to prevent injury or accidents (noun.artifact)

part meronym	:	gun,
definition	:	a weapon that discharges a missile at high velocity (especially from a metal tube or barrel) (noun.artifact)