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British Dictionary definitions for blowback

blowback

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
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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

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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.

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Online Etymology Dictionary, © 2010 Douglas Harper