打黑槍

Simplified: 打黑枪

dǎhēiqiāng ㄉㄚˇ ㄏㄟ ㄑㄧㄤ

    • to harm someone secretly, attacking from hiding

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
to fire a shot in the dark
Meaning
To harm someone secretly, attacking from hiding. Critical.

Sources