blow-by

noun

In an internal combustion engine, any burnt or unburnt matter escaping from the cylinder, past the (worn) rings on the piston, and into the crankcase.

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Meanings

nounblow-by (countable and uncountable, plural blow-bys)

plural blow-bys

  1. countableuncountableautomotiveIn an internal combustion engine, any burnt or unburnt matter escaping from the cylinder, past the (worn) rings on the piston, and into the crankcase.
Cite this entry
APA

blow-by. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/blow-by

MLA

“blow-by.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/blow-by. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “blow-by,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/blow-by.

Source: blow-by on Wiktionary, CC BY-SA 4.0.