ㄉㄜˊㄘㄨㄣˋㄐㄧㄣˋˇdécùn‑jìnchǐ

得寸进尺
  1. 比喻貪得無厭 做人感恩知足不可得寸進尺」。

lit. win an inch, want a foot (idiom)​; fig. not satisfied with small gains, give him an inch, and he'll want a mile
émettre des exigences toujours plus grandes, Donnez-lui la main, il prendra le bras.