BLOW BY

blow-by

[bloh-bahy]
noun, plural blow-bies. Automotive.
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.


Origin:
1930–35; noun use of verb phrase blow by

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World English Dictionary
blow-by
 
n
the leakage of gas past the piston of an engine at maximum pressure

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