不做脸

Traditional (Taiwan): 不做臉

bùzuòliǎn ㄅㄨˋ ㄗㄨㄛˋ ㄌㄧㄢˇ

    • to fail to live up to expectations and embarrass one's elders

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
not doing face
Meaning
Failing to live up to expectations and so embarrassing parents or teachers. Critical, dialectal.

Sources