From Longman Dictionary of Contemporary Englishvouch for somebody/something phrasal verb1 BELIEVEto 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 RESPONSIBLEto 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. → vouch→ See Verb table
Examples from the Corpus
vouch for • Claims that verge on the outrageous are made for this material - but very many fishkeepers will vouch for its effectiveness.• The explosive used is of my own formulation, and I can vouch for its efficiency.• My wife can vouch for that, officers.• I can vouch for that when we get back to the States.• Having spent some time loading and editing complicated vector graphics files in CorelDRAW I can vouch for the accuracy of this claim.• The twenty workers who build his houses have been taken on because Les knows them personally and can vouch for their reliability.• I can't vouch for this hotel but it looked wonderful for a romantic weekend.• I can not vouch for this.vouch for that• Gerard Houllier can vouch for that after a dramatic finale to the Worthington Cup Final.• My wife can vouch for that, officers.• I can vouch for that when we get back to the States. 