WordReference Random House Learner's Dictionary of American English © 2026
sub•ma•chine gun /ˌsʌbməˈʃin ˌgʌn/USA pronunciation n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Militaryan automatic gun using small-caliber bullets and fired from the shoulder or hip.
sub•ma•chine′ gun′
(sub′mə shēn′),USA pronunciation
- Militarya lightweight automatic or semiautomatic gun, fired from the shoulder or hip.
- sub- + machine gun 1915–20
'submachine gun' also found in these entries (note: many are not synonyms or translations):