"fly in the ointment : (idiomatic) Something (especially a minor thing) which ruins or spoils..."

“fly in the ointment : (idiomatic) Something (especially a minor thing) which ruins or spoils everything else, or makes it less pleasant; a nuisance or problem; a disagreeable or unpleasant detail.”

- https://en.wiktionary.org/wiki/fly_in_the_ointment#English

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