submachine gun

US /ˈsʌb.mə.ʃiːn ˌɡʌn/
UK /ˈsʌb.mə.ʃiːn ˌɡʌn/
"submachine gun" picture
1.

a light automatic gun firing pistol-caliber ammunition, designed for close-quarters combat.

:
The police officer carried a submachine gun during the raid.
The soldiers were equipped with rifles and submachine guns.