English Lexicon

Blow-by

/ˈblouˌbaɪ/
nounCEFR C1 (Advanced)Top #28450 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    Leakage of combustion gases from the cylinder past the piston rings into the engine crankcase.

    "Excessive blow-by can lead to increased crankcase pressure and oil contamination."
  2. 2

    Unburnt fuel or exhaust gases escaping past turbine or compressor seals in machinery.

    "The maintenance crew checked the turbocharger seals for signs of blow-by."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the verbal phrase 'blow by', originating in early 20th-century mechanical engineering contexts. It describes the action of high-pressure gases leaking past the piston rings into the crankcase of an internal combustion engine.

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