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Synonyms for vouch

verb

assert, aver, attest, warrant, affirm, verify, confirm, guarantee, asseverate, declare, testify, bear testimony, corroborate, protest, assure, predicate, profess, put forth, maintain, contend, depose, avow, swear, take affidavit, take a Bible oath, go bail on, kiss the Book; see also endorse 2.

Antonyms deny*, repudiate, discard.

See vouch in Webster's New World Roget's A-Z Thesaurus II

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