blow-by

or blow·by

[ bloh-bahy ]
/ ˈbloʊˌbaɪ /

noun, plural blow-bies. Automotive.

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.

Origin of blow-by

First recorded in 1930–35; noun use of verb phrase blow by

Words nearby blow-by

blow someone to, blow the lid off, blow the whistle on, blow through, blow up, blow-by, blow-by-blow, blow-comb, blow-dry, blow-dryer, blow-hard

British Dictionary definitions for blow by

blow-by

noun

the leakage of gas past the piston of an engine at maximum pressure