Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: vocher 'to state, call as a witness', from Latin vocare; VOCATION

vouch

 verb
     
vouch

vouch for somebody/something

phrasal verb
1 to say that you firmly believe that something is true or good because of your experience or knowledge of it:
I'll vouch for the quality of the report. I read it last night.
'Where were you on the night of the murder?' 'In bed with flu. My wife can vouch for that.'
2 to say that you believe that someone will behave well and that you will be responsible for their behaviour, actions etc:
Why don't you phone my office? They'll vouch for me.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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