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English definition of “fly in the ointment”

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fly in the ointment

informal
a single thing or person that is spoiling a situation that could have been very positive or enjoyable: I'm looking forward to Sunday, the only fly in the ointment being the fact that I'll have to sit next to my mother-in-law.
Translations of “fly in the ointment”
in Chinese (Traditional) 美中不足之處, 令人掃興的東西(或人)…
in Chinese (Simplified) 美中不足之处, 令人扫兴的东西(或人)…
(Definition of fly in the ointment from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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