downwash

From down- +‎ wash.

• Rhymes: -ɒʃ

downwash (plural downwashes)

1. downward air turbulence caused by a propeller or jet, but especially by helicopter blades
2. The downward motion of air as a result of eddies behind a wing or chimney, etc.
   • 2008, John S. Denker, How It Flies:

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

• upwash

• backwash

• wash down, washdown