打活靶

dǎhuóbǎ ㄉㄚˇ ㄏㄨㄛˊ ㄅㄚˇ

    • to single out a person as the target of criticism for one's own purposes

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
shoot at a moving target
Meaning
To single out a person as the target of criticism because it suits some purpose. Critical.

Sources