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fly in the ointment noun

  /ˈflaɪ ən ði ˈɔɪn(t)m(ə)nt/ , /ˈflaɪ ɪn ði ˈɔɪntm(ə)nt/
  • (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.
 ло́жка дёгтя, ло́жка дёгтя в бо́чке мёда
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