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blowback

/ˈbləʊˌbæk/
noun
1.
the escape to the rear of gases formed during the firing of a weapon or in a boiler, internal-combustion engine, etc
2.
the action of a light automatic weapon in which the expanding gases of the propellant force back the bolt, thus reloading the weapon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for blowback
n.

also blow-back, 1883, in reference to flames in enclosed spaces (firearms, furnaces, etc.), from blow (v.1) + back (adv.). Sense in reference to convert actions, etc., is from 1978.

Online Etymology Dictionary, © 2010 Douglas Harper
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