- Thompson submachine gun.
- any submachine gun.
Origin of Tommy gun
First recorded in 1920–25; by shortening
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for tommy gun
And they've got four sawed-off shotguns and a tommy-gun in the back seat.The Ambulance Made Two Trips
William Fitzgerald Jenkins
Before the boys piled in, Stan handed his tommy-gun to Allison.
He could not find a tommy-gun, but he had the sack of grenades on his lap.
Stan armed himself with a tommy-gun and rode up front with Arno.
Implacably, the big guard brought up his Tommy-gun and let it rattle.Satan and the Comrades
- an informal name for Thompson sub-machine-gun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012