挖墙脚

verb

to undermine; to sabotage; to cut the ground from under someone's feet; (in business) to poach key personnel from a competitor

Originally refers to digging at the foundation of a wall, causing it to collapse. Metaphorically describes actions that secretly damage someone's foundation, interests, or relationships. In business contexts, it specifically refers to poaching key employees from competitors. Often carries a negative connotation.