指脊梁骨

zhǐjǐliánggǔ ㄓˇ ㄐㄧˇ ㄌㄧㄤˊ ㄍㄨˇ

    • to criticise or condemn someone behind their back
    • to blame someone

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
point at someone's spine
Meaning
To criticise or condemn someone behind their back, or to jab at them with blame. See 戳脊梁骨.

Sources