machine gunEnglishOxford New American Dictionarymachine gun /məˈSHēn ɡən, məˈʃin ɡən / ▸ noun an automatic gun that fires bullets in rapid succession for as long as the trigger is pressed: [as modifier] machine-gun fire. ▸ verb (machine-gun) [with object] shoot with a machine gun: a corporal had been machine-gunned in an ambush. – DERIVATIVES machine-gunner /məˈSHēn ˌɡənər, məˈʃin ˌɡənər/ noun