vouch /vaʊtʃ/
verb[
Date: 1300-1400;
Language: Old French;
Origin: vocher 'to state, call as a witness', from Latin vocare; ⇒ vocation]
vouch for somebody/something phrasal verb1. 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. [TahlilGaran] Dictionary of Contemporary English ▲