vouches , vouching , vouched
vouch for
If you say that you can or will vouch for someone, you mean that you can guarantee their good behaviour.
Kim's mother agreed to vouch for Maria and get her a job.
金的母亲同意为玛丽亚担保,好让她找份工作。
If you say that you can vouch for something, you mean that you have evidence from your own personal experience that it is true or correct.
He cannot vouch for the accuracy of the story.
他不能证明这一说法的准确性。