machine gunEnglishOxford Dictionary of Englishmachine gun /məˈʃiːn ɡʌn / ▸ noun an automatic gun that fires bullets in rapid succession for as long as the trigger is pressed: [as modifier] machine-gun fire. ▸ verb [with object] (machine-gun) shoot with a machine gun: a corporal had been machine-gunned in an ambush. – DERIVATIVES machine-gunner /məˈʃiːnˌɡʌnə / noun