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blow-back
blow-back n.
Brit. 
/ˈbləʊbak/
, /ˈbləʊbak/U.S. /ˈbloʊˌbæk/
the act or process of blowing back; spec. (a) the back-pressure in a boiler or internal-combustion engine; (b) in firearms (cf. blow v.1 24e)./ˈbloʊˌbæk/ΚΠ
1883 J. D. Fulton Sam Hobart, Locomotive Engineer 224 The flames originated from the ‘blow back’ on the engine.
1899 Westm. Gaz. 13 July 7/2 Foul barrels were the cause of ineffectual shots and ‘blow-back’ caps.
1905 Kynoch Jrnl. Jan.–Mar. 10 The cracks..will at once develop into fissures when the cartridge is fired, cause ‘blow-backs’, and seriously reduce the velocity of the projectile.
1907 Daily Chron. 22 July 7/1 His cartridge being a defective one—what is called a ‘blow back’.
1929 Evening News 18 Nov. 14/3 He received his injuries as the result of a blow-back in one of the boilers when pulverised fuel was being lit.
1940 Chambers's Techn. Dict. 98/2 Blow back, the return, at low speeds, of some of the induced mixture through the carburettor of a petrol-engine; due to late closing of the inlet valve during compression.
blow-back
blow-back n.
Brit. /ˈbləʊbak/
, /ˈbləʊbak/U.S. /ˈbloʊˌbæk/
figurative (chiefly U.S.) the adverse consequences of a (political) situation or action (in quot. blow- comb. form as part of an extended metaphor)./ˈbloʊˌbæk/ΚΠ
1968 Times 25 Nov. 8/3 It will not help Mr Jenkins much if he tries to explain himself by going into all the relevant intricacies of demand management, and the blowback on sterling from the mark's exhaust.
1988 C. Simpson Blowback i. 5 This impact is what is known in spy jargon as ‘blowback’, meaning unexpected—and negative—effects at home that result from covert operations overseas.
1993 Coloradoan (Fort Collins) 11 July e4/5 The trouble we're having now is blowback off the Afghan War.
2000 Nation (N.Y.) 20 Nov. 22/2 Twenty years after Washington armed the mujahedeen to drive the Soviet Union out of Afghanistan, Russia must now protect the West from the blowback of that policy.
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