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Noun: updraught
Usage: Brit (N. Amer: updraft)
  1. A strong upward air current
    "Glider pilots seek out updraughts to gain altitude";
    - updraft [N. Amer], upcurrent

Derived forms: updraughts

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

Encyclopedia: Updraught