sub-machine gunBrE /ˌsʌb məˈʃiːn ɡʌn/ 🔊NAmE /ˌsʌb məˈʃiːn ɡʌn/ 🔊 nouna light machine gun that you can hold in your hands to fire 冲锋枪;轻型自动枪 See sub- for more