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Tommy

noun

a male given name, form of Thomas.
Also Tom·mie, Tom·mye. a female given name, form of Thomasina.

noun plural -mies

(often capital) British informal a private in the British ArmyAlso called: Tommy Atkins (ˈætkɪnz)

“British soldier,” 1884, from Thomas Atkins, since 1815 the sample name for filling in army forms. Tommy gun (1929) is short for Thompson gun (see Thompson). Soon extended to other types of sub-machine gun, especially those favored by the mob.