WordReference Random House Unabridged Dictionary of American English © 2025
Thomp′son submachine′ gun′, 
  1. Militarya portable,.45-caliber, automatic weapon designed to be fired from the shoulder or hip. Also called Tommy gun. 
  • named after J. T. Thompson (1860–1940), American army officer who aided in its invention 1920–25

'Thompson submachine gun' also found in these entries (note: many are not synonyms or translations):
Tommy gun

Forum discussions with the word(s) "Thompson submachine gun" in the title:


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