Definitions from Wiktionary (blowback)

▸ noun:  (firearms) A type of action where the pressure from the fired cartridge blows a sliding mechanism backward to extract the fired cartridge, chamber another cartridge, and cock the hammer.
▸ noun:  An unintended adverse result, especially of covert political action.
▸ noun:  (slang) The act of shotgunning (inhaling from a pipe etc. and exhaling into another smoker's mouth).
▸ noun:  (rail transport) On a steam locomotive, the reversal of exhaust gases when the regulator is closed without using the blower.
▸ noun:  (computing) Synonym of backscatter.
▸ Also see blowback


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