拔钉子

Traditional (Taiwan): 拔釘子

bádīngzi ㄅㄚˊ ㄉㄧㄥ ˙ㄗ

    • to remove an obstacle holding up progress
    • to purge a planted mole

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
pulling out nails
Meaning
Removing an individual obstacle holding up overall progress, or purging a dangerous planted person from one's own ranks.

Sources