挖墙脚

Traditional (Taiwan): 挖牆腳

wāqiángjiǎo ㄨㄚ ㄑㄧㄤˊ ㄐㄧㄠˇ

    • to undermine
    • to let someone down
    • to seduce someone away from something

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
to dig out the foot of the wall
Meaning
To undermine someone's position or poach their people or business. Critical.

Sources