[no obj.](vouch for)assert or confirm as a result of one's own experience the truth or accuracy of (something) 保证,担保,证明 the explosive used is of my own formulation, and I can vouch for its efficiency. 所用炸药是我自己的配方,我可以保证其功效。 ■confirm the identity or good character of (someone) 确认…的身份;证明…的人品 he was refused entrance until someone could vouch for him. 直到有人为他证明,他才获准进入。
语源
Middle English (as a legal term in the sense 'summon a person to court to prove title to property'): from Old French voucher 'summon', based on Latin vocare 'to call'