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exhaust-gas recirculation

American  
[ig-zawst-gas] / ɪgˈzɔstˌgæs /

noun

Automotive.

  1. a method of returning part of the exhaust gases to an engine by means of a valve EGR valve in order to reduce the combustion temperature, which leads to a reduction in the formation of pollutants. EGR

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.