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submachine gun

[suhb-muh-sheen] /ˌsʌb məˈʃin/
noun
1.
a lightweight automatic or semiautomatic gun, fired from the shoulder or hip.
Origin
1915-1920
1915-20; sub- + machine gun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for sub-machine gun
n.

"light, portable machine gun," 1926, from sub- + machine gun.

Online Etymology Dictionary, © 2010 Douglas Harper
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