倒牌子

dǎopáizi ㄉㄠˇ ㄆㄞˊ ˙ㄗ

    • to lose one's good reputation and credibility

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
the brand falls
Meaning
A brand, person or organisation loses its good reputation and credibility. Used critically.

Sources