Home › Words › U › upwashupwashupwash means upward air turbulence caused by a propeller or jet.Among words judged in Lexicurio's Arena, upwash ranks #16,730 of 42,747 for Qualifying.EtymologyFrom up- + wash.nounupward air turbulence caused by a propeller or jetThe upward motion of air as a result of eddies behind a wing or chimney, etc.e.g.“There is significant upwash ahead of the wing and even more downwash behind the wing.” — 2008, John S. Denker, How It Flies:Definitions & examples from Wiktionary (CC BY-SA 3.0).