反目成仇

fǎnmùchéngchóu
(idiom) to fall out with sb; to become enemies

CEDICT

to fall out and become enemies

Wiktionary

双方从和睦的关係转变成仇视敌对的状态。

重編國語辭典

双方从和睦关係转变成敌对状态

維基詞典

Entry Composition

1 反目 fǎnmù
  1. to quarrel
  2. to fall out with sb
2 成仇 chéngchóu to become enemies