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blow-by

[bloh-bahy] /ˈbloʊˌbaɪ/
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
1930-1935
1930-35; noun use of verb phrase blow by
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for blow-by

blow-by

noun
1.
the leakage of gas past the piston of an engine at maximum pressure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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