a shotgun or rifle having a pump-action mechanism.
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Origin of pump gun
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for pump gun
Yes, just as a fellow will work his pump-gun, after firing a round.The Saddle Boys at Circle Ranch|James Carson
Id like to run across something worth taking a crack at with my pump-gun.The Outdoor Chums in the Big Woods|Quincy Allen
A much more serviceable gun to repel a counter-attack would be one firing buckshot like a pump-gun."Over There" with the Australians|R. Hugh Knyvett
British Dictionary definitions for pump gun
a repeating gun operated by a slide-action mechanism feeding ammunition from a magazine under the barrel into the breech
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