兩敗俱傷（兩敗俱傷）　

◎ 兩敗俱傷 liǎngbài-jùshāng

[internecine;both parties be weakened by mutual homicide;both being defeated and wounded; both sides suffer; cut one another‘s throat; neither side gains] 爭斗的雙方都受到損失

倘若大人再要回護他三人,將來一定兩敗俱傷,于大人反為無益。——清· 李寶嘉《官場現(xiàn)形記》