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submachine gun

[suhb-muh-sheen]
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noun
  1. a lightweight automatic or semiautomatic gun, fired from the shoulder or hip.

Origin of submachine gun

First recorded in 1915–20; sub- + machine gun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for sub-machine gun

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper