失误的英语是 "mistake"。来自拉丁文 "mistake"，原意为"错误、误解"。

例句：

I made a mistake on the exam. 我考试上出了失误。

It was a mistake to trust him. 信任他是一个失误。

She realized her mistake and apologized. 她意识到了自己的失误并道歉了。