fly in the ointment
US /flaɪ ɪn ðɪ ˈɔɪnt.mənt/
UK /flaɪ ɪn ðɪ ˈɔɪnt.mənt/

1.
옥에 티, 흠
a minor irritation or flaw that spoils an otherwise pleasant situation
:
•
The trip was perfect, except for one fly in the ointment: the weather was terrible.
여행은 완벽했지만, 한 가지 옥에 티는 날씨가 끔찍했다는 것이다.
•
His bad mood was the only fly in the ointment during the celebration.
그의 나쁜 기분은 축하 행사에서 유일한 옥에 티였다.