deadly foe 死对头

“死对头”，汉语词语，意思是指难以和解的仇敌。可以翻译为“deadly foe，sworn enemy或mortal enemy”等。

例句：

现在她成了他的死对头，这似乎并不奇怪。

It somehow seems hardly surprising that she is now his sworn enemy.

他们是我的死对头。

They are my sworn foes.