vouch vb[Anglo-French voucher to call, summon, summon to court as guarantor of a title, ultimately from Latin vocare to call, summon]
1 : to summon into court
2 : to verify (a business transaction) by examining documentary evidence
1 : to become surety
2 a : to supply supporting evidence or testimony
b : to give personal assurance
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.