Bête noire
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A French expression meaning 'black beast,' used to refer to a person or thing that one particularly dislikes or dreads.
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Mentioned once in Something Borrowed, Someone Blue [1].
Something Borrowed, Someone Blue [1]
Season 7 · Episode 23 · S07E23
“I've come attuned to her various quirks... eccentricities... bugaboos.... bête noirs... night terrors.”