[1] : The Collaborative International Dictionary of English v.0.48

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
see also:
submachine gun 

[2] : WordNet (r) 2.0

submachine gun
     n : machine gun that is a portable automatic firearm

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