From Longman Dictionary of Contemporary Englishvouchvouch /vaʊtʃ/ verb → vouch for somebody/something→ See Verb table
Examples from the Corpus
vouch• Rastani and I can vouch for each other.• 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.• It's now up to the country of origin to vouch for the health of the animals.• The twenty workers who build his houses have been taken on because Les knows them personally and can vouch for their reliability.• I can not vouch for this.Origin vouch (1300-1400) Old French vocher “to state, call as a witness”, from Latin vocare; → VOCATION 