zakopaný pes, žába na prameny
After the exams, we had a great celebration party. The only fly in the ointment was that Patrick hadn`t passed. (English Idioms, Oxford)
The only fly in the ointment was my mother, who insisted on whispering through the first half of the show.(CIDI)
The fly in the ointment is that a boy saw you kissing Lola. (W.Magnuson, Eng.Idioms)
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