vouch

vouch

verb acknowledge, adseverare, affirm, assure, attest, authenticate, aver, avouch, back, bear witness, certify, confirm, corroborate, declare, depone, 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

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See also: attest, avouch, avouchment, avow, certify, contend, depose, maintain, posit, promise, seal, swear, testify, vow

vouch

to cite by reference to precedents, statutes or books of authority.