blowby

noun
blow·​by | \ ˈblō-ˌbī How to pronounce blowby (audio) \

Definition of blowby

: leakage of combustion gases between a piston and the cylinder wall into the crankcase in an automobile

First Known Use of blowby

1908, in the meaning defined above

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The first known use of blowby was in 1908

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