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Noun: downwash  'dawn,wósh
  1. A turbulent downward air current caused by a propeller or jet, esp. below helicopter blades
    "the downwash of the helicopter made it exceedingly difficult for Andrew to remain standing"

Derived forms: downwashes

Type of: downdraft [N. Amer], downdraught [Brit, Cdn]

Encyclopedia: Downwash