“两败俱伤”，汉语成语，意思是斗争双方都受到损伤，谁也没得到好处（there is no victor in the strife）。可以翻译为“both sides suffer/lose，或neither side gains/wins”。

例句：

在那场战争中他们两败俱伤。

Neither side gained in the war.

还是讲和为好，免得两败俱伤。

It would be better for both sides to make peace than to wear each other out.