掛黃牌

Simplified: 挂黄牌

guàhuángpái ㄍㄨㄚˋ ㄏㄨㄤˊ ㄆㄞˊ

    • to issue an official warning to a wrongdoer

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
hang up a yellow card
Meaning
To give an official warning to a person or organisation that has done wrong, as a referee does in football. Used in news and official contexts, and it is neutral to stern.

Sources