A stuffy, warm atmosphere; a sense of stale air or mustiness, particularly in enclosed spaces.
British dialectal or colloquial term, possibly related to frousy or froust as a verb meaning 'to laze in a stuffy room'; etymology uncertain but likely from Dutch or Low German roots.
A froust perfectly describes that weird feeling when you walk into an old British pub or library—warm, slightly stale air, comfort mixed with stuffiness.
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