vouching

He vouched his words by his deeds.

用自己的行动明了自己的言辞。

They asked whether I was prepared to vouch for him.

我是否愿意作担。

I can vouch for the fact that he is a good worker.

我是好员工。

You should give the names of two people who can vouch for your honesty and reliability.

你应该提供两个能担你诚实可信的人的名字。