An exclamation expressing disgust, shame, or disapproval; a word that shows you think something is wrong or unpleasant.
From Middle English and Latin 'fi' or 'fie,' an imitative word expressing disapproval. The word has been used since at least the 1200s and is particularly associated with Shakespeare's era and earlier.
'Fie' is one of the oldest interjections still recognizable in English, and Shakespeare used it constantly in his plays—it's a linguistic fossil from Middle English that refuses to disappear even though most people don't use it anymore!
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