vouch /'vau̇ch/ vb [Anglo-French voucher to call, summon, summon to court as guarantor of a title, ultimately from Latin vocare to call, summon]vt1: to summon into court2: to verify (a business transaction) by examining documentary evidencevi1: to become surety2 a: to supply supporting evidence or testimonyb: to give personal assurance
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.
acknowledge, aciseverare, affirm, assererate, assure, attest, authenticate, aver, avouch, back, bear witness, certify, confirm, corroborate, declare, depone, depose, endorse, give assurance, give evidence, give one's word, guarantee, maintain by affirmation, pledge, promise, rem praestare, secure, support, sustain, swear to, testify, underwrite, uphold, warrant, witness
affirm (declare solemnly), avouch (avow), avouchment, avow, certify (attest), contend (maintain), depose (testify), posit, promise (vow), seal (solemnize), swear, vow
Burton's Legal Thesaurus. William C. Burton. 2006
v.To verify; to confirm that a person is of good character or qualified for a position; to assert that something is true, based on personal experience.
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.