English version

a fly in the ointment

From Longman Dictionary of Contemporary Englisha fly in the ointmenta fly in the ointmentinformalSPOIL the only thing that spoils something and prevents it from being successful The only fly in the ointment was Jacky. fly
Examples from the Corpus
a fly in the ointmentThere had to be a snag, of course, a fly in the ointment.
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