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English definition of “tommy gun”

tommy gun

noun [C]     /ˈtɒm.i.ɡʌn/ US  /ˈtɑː.mi-/
a light machine gun (= a gun that fires many bullets quickly) that is held in the handHandguns and riflesAiming and aimHand weapons
(Definition of tommy gun noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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