from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A lightweight automatic gun that shoots pistol ammunition, is usually fired from the shoulder or hip, and often has the capacity for shooting single rounds.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A type of short range machine gun that is carried as a personal weapon and uses pistol ammunition.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. machine gun that is a portable automatic firearm
From sub- + machine gun. (Wiktionary)