刨祖坟

Traditional (Taiwan): 刨祖墳

páozǔfén ㄆㄠˊ ㄗㄨˇ ㄈㄣˊ

    • to dig into someone's family background
    • to deeply offend someone's ancestors

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
to dig up ancestors' graves
Meaning
A variant of 挖祖坟: to dig into someone's family background, or to do something deeply offensive to a person's ancestors. Hostile in tone.

Sources