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WordReference Random House Unabridged Dictionary of American English © 2024blow-by (blō′bī′),USA pronunciation n., pl. -bies. [Auto.]- leakage of the air-fuel mixture or of combustion gases between a piston and the cylinder wall into the crankcase of an automobile.
- a device, fitted to a crankcase, for conducting such gases back to the cylinders for combustion.
Also, blow′by′. - noun, nominal use of verb, verbal phrase blow by 1930–35
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