戳伤疤

Traditional (Taiwan): 戳傷疤

chuōshāngbā ㄔㄨㄛ ㄕㄤ ㄅㄚ

    • to bring up someone's painful past and hurt them

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
poke a scar
Meaning
To bring up someone's painful past and hurt them. Said critically of tactless remarks.

Sources