turd in the punchbowl

Noun

idiomatic slang vulgar

(idiomatic, vulgar, slang) Something that ruins or spoils everything else; a nuisance or problem; an unpleasant or disagreeable detail.

Japanese Meaning

全体を台無しにする存在 / 迷惑なものや人物、問題のある要素 / 不快で嫌な余計な部分や細部

When she arrived late with the bad news, she was the turd in the punchbowl at the celebration.

彼女が遅れて悪い知らせを伝えたとき、祝賀会の雰囲気を台無しにする存在だった。

Sense（1）

(idiomatic, vulgar, slang) Something that ruins or spoils everything else; a nuisance or problem; an unpleasant or disagreeable detail.

turds in the punchbowl

（ plural ）