'submachine gun' definitions:
Definition of 'submachine gun'
From: WordNet
noun
Machine gun that is a portable automatic firearm
Definition of 'submachine gun'
From: GCIDE
- machine gun \machine gun\ n. A fully automatic rapid-firing rifle, which continues to fire bullets repeatedly as long as the trigger is depressed; lighter versions may be carried in the hands, and heavier versions may be mounted on a tripod, vehicle, or other mount. The lighweight versions are sometimes called a {submachine gun}. [PJC] machine-gun