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bump stock

[ buhmp-stok ]
/ ˈbʌmp ˌstɒk /
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noun
a replacement gunstock that enables a semiautomatic rifle to discharge bullets at a much higher rate of fire, nearly that of a fully automatic machine gun.
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Also called bump-fire stock [buhmp-fahyer stok] /ˈbʌmpˌfaɪər ˌstɒk/ .

Origin of bump stock

First recorded in 2005–10; short for bump fire (from its use of the recoil to bump the trigger against the trigger finger) + (gun)stock
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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