gunman
noun [ C ] uk/ˈɡʌn.mən/ us/ˈɡʌn.mən/ -men uk/ˈɡʌn.mən/ us/ˈɡʌn.mən/
持枪者；（通常指）持枪犯罪分子，持枪歹徒
a man, usually a criminal, who is armed with a gun
The three men were held hostage for two days by masked gunmen. 这3名男子被一伙蒙面持枪歹徒劫持为人质达两天之久。
Compare: gunslinger