Definition of tommy gun in English:

tommy gun

Syllabification: tom·my gun
Pronunciation: /ˈtämē ˌgən
 
/

noun

informal
  • A type of submachine gun.
    More example sentences
    • Meanwhile our heroes have a couple of handguns and a tommy gun.
    • Capone's usual partner was Jack McGurn, a sleek, handsome virtuoso of the tommy gun, architect of the St. Valentine's Day shootings.
    • In one of the film's most famous scenes, Camonte secures a tommy gun from a now dead, would-be assassin and, with the joy and fascination of a child at Christmas, tries out his new toy.

Origin

1920s: contraction of Thompson gun, named by its designer after John T. Thompson (1860–1940), the US army officer who conceived the idea for it.

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