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English definition of “fly in the ointment”

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 shall have to sit next to my mother-in-law.Difficult things and peoplePreventing and impeding
(Definition of fly in the ointment from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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