挨黑枪

Traditional (Taiwan): 挨黑槍

áihēiqiāng ㄞˊ ㄏㄟ ㄑㄧㄤ

    • to be stabbed in the back
    • to be attacked secretly by someone

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
to take a shot from a hidden gun
Meaning
To be attacked or undermined by someone secretly behind your back; to be stabbed in the back.

Sources