blow-by


Also found in: Medical, Wikipedia.

blow-by

n
(Automotive Engineering) the leakage of gas past the piston of an engine at maximum pressure
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

blow′-by`



n., pl. -bys.
leakage of combustion gases between a piston and the cylinder wall into the crankcase of an automobile.
[1930–35]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.