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Adjective: draughtproof  draaft-proof
Usage: Brit
  1. Sealed to the outside to prevent currents of cool air
    - draftproof [N. Amer]
Verb: draughtproof  draaft-proof
Usage: Brit
  1. Seal to keep stop cool air flowing in
    - draftproof [N. Amer]

Derived forms: draughtproofing, draughtproofs, draughtproofed