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Noun: downdraft  'dawn,draft
Usage: N. Amer (elsewhere: downdraught)
  1. A strong downward air current
    "The airplane encountered severe turbulence due to a downdraft";
    - downdraught [Brit, Cdn]

Derived forms: downdrafts

Type of: draft [N. Amer], draught [Brit, Cdn]

Encyclopedia: Downdraft