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Noun: frowst
Usage: Brit, informal
  1. Stuffiness; stifling warmth in a room
    "The frowst in the poorly ventilated classroom made the students drowsy"
Verb: frowst
Usage: Brit, archaic
  1. Stay in a warm stuffy atmosphere
    "He frowsted in bed all morning, reluctant to face the cold"

Derived forms: frowsted, frowsts, frowsting