I'll engage for John's behaviour should you decide to employ him.

如果你决定聘用约翰，我愿为他的行为担保。

《新英汉大辞典》

I'll engage for John's behaviour should you decide to employ him.

如果你决定聘用约翰，我愿为他的行为担保。

《新英汉大辞典》