WordReference Random House Unabridged Dictionary of American English © 2025
blow-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.
- noun, nominal use of verb, verbal phrase blow by 1930–35
'blow-by' also found in these entries (note: many are not synonyms or translations):