ㄓㄢˇㄘㄠˇㄔㄨˊㄍㄣzhǎncǎo‑chúgēn

斩草除根
  1. 除草連根拔以免比喻澈底除去禍根後患 斬草除根避免後患」。

to cut weeds and eliminate the roots (idiom)​; to destroy root and branch, to eliminate completely
extirper les mauvaises herbes, détruire le mal à sa racine