亮黄牌

Traditional (Taiwan): 亮黃牌

liànghuángpái ㄌㄧㄤˋ ㄏㄨㄤˊ ㄆㄞˊ

    • to give a formal warning

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
show the yellow card
Meaning
To give a formal warning, as a referee does for a foul in sport.

Sources