翻脸不认人

Traditional (Taiwan): 翻臉不認人

fānliǎnbùrènrén ㄈㄢ ㄌㄧㄢˇ ㄅㄨˋ ㄖㄣˋ ㄖㄣˊ

    • to fall out with sb and become hostile

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
to turn one's face and not know people
Meaning
To suddenly change attitude and drop old ties. Critical.

Sources