Thompson submachine gun(redirected from Thompson M1921)
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Thompson submachine gun
A .45-caliber submachine gun having a wooden stock and a box or drum magazine.
[After John Taliaferro Thompson (1860-1940), American army officer.]
Thomp′son submachine′ gun`
a.45-caliber automatic weapon designed to be fired from the shoulder or hip.Also called Tommy gun.
[1920–25; after John T. Thompson (1860–1940), American army officer who aided in its invention]