Definition of vouch for phrasal verb from the Oxford Advanced Learner's Dictionary

 

vouch for

 phrasal verb
phrasal verb
 
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Phrasal Verbs

vouch for somebody

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vouch for something

 
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(formal) to say that you believe that somebody will behave well and that you will be responsible for their actions Are you willing to vouch for him? I can vouch for her ability to work hard.
(formal) to say that you believe that something is true or good because you have evidence for it synonym confirm I was in bed with the flu. My wife can vouch for that.
See the Oxford Advanced American Dictionary entry: vouch for