同仇敌忾

同仇敵愾
tóngchóudíkài
anger against a common enemy (idiom); joined in opposition to the same adversary

CEDICT

to unite against a common enemy

Wiktionary

同仇，一致对付仇敌。参见「同仇」条。敌忾，抵御所恼恨的人。参见「敌忾」条。同仇敌忾指共同抱着愤恨心情，齐心同力抵抗敌人。

重編國語辭典

Entry Composition

1 同仇 tóngchóu
  1. (literary) to unite against a common enemy
  2. to unite against a common enemy
2 敌忾 díkài hatred felt toward one's enemies