See corroborate in Webster's New World Roget's A-Z Thesaurus II
verb
To present evidence in support of:
back (up), buttress, substantiate. See supportTo assure the certainty or validity of:
attest, authenticate, back (up), bear out, confirm, evidence, justify, substantiate, testify (to), validate, verify, warrant. See support, trueTo establish as true or genuine:
authenticate, bear out, confirm, demonstrate, endorse, establish, evidence, prove, show, substantiate, validate, verify. See show, support
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