/bloh"buy'/ , n. , pl. blow-bies . Auto.
1. leakage of the air-fuel mixture or of combustion gases between a piston and the cylinder wall into the crankcase of an automobile.
2. a device, fitted to a crankcase, for conducting such gases back to the cylinders for combustion.
Also, blowby .
[ 1930-35; n. use of v. phrase blow by ]