submachine gun

[suhb-muh-sheen]

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