Definition of tommy gun noun from the Oxford Advanced Learner's Dictionary

 

tommy gun

 noun
noun
BrE
 
; NAmE
 
 
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a type of sub-machine gun Word Origin 1920s: contraction of Thompson gun, named by its designer after John T. Thompson (1860–1940), the American army officer who conceived the idea for it.
See the Oxford Advanced American Dictionary entry: tommy gun