a blight on (something)

Translations
пятно на (чем-то)
The scandal was a blight on his otherwise successful career.
Скандал стал пятном на его успешной карьере.
Definitions
A blight on (something) refers to a negative influence or detrimental effect that spoils or damages the quality, reputation, or condition of that thing.
Words
blight

noun
порча