Fromdown- +‎wash.

• Rhymes:-ɒʃ

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downwash

Wikipedia

downwash (pluraldownwashes)

1. downwardairturbulence caused by apropeller orjet, but especially byhelicopterblades
2. The downwardmotion of air as a result ofeddies behind awing orchimney, etc.
   • 2008, John S. Denker,How It Flies:

     There is significant upwash ahead of the wing and even moredownwash behind the wing.

• upwash

• backwash

• wash down,washdown

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