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Definition of avouch : 1. Evidence; declaration.
2. To acknowledge deliberately; to admit; to confess; to sanction.
3. To appeal to; to cite or claim as authority.
4. To declare or assert positively and as matter of fact; to affirm openly.
5. To maintain a just or true; to vouch for.

Synonyms:

knowledge, hold, swan, argue, swear, avow, say, asseverate, allege, have it, confess, own, protest

profess, propound, accept, ratify, pledge, validate, contend, certify, admit, declare, promise, corroborate, express, maintain, sustain, submit, endorse, assure, warrant, verify, claim, acknowledge, testify, adjure, approve, affirm, support, proclaim, state, aver, attest, pronounce, assert, set down

establish, witness, indicate, exemplify, prove, demonstrate, adduce, exhibit, depose, authenticate, illustrate, confirm, determine, betoken, observe, substantiate, vouch, connote, manifest, evince, document

Usage examples:

• Rarely, but on some peculiarly important occasions, the Zveltau avouch their sincerity by an appeal to their own symbols; and it is affirmed that an oath attested by the Circle and the Star has never, in the lapse of ages, been broken or evaded. - "Across the Zodiac", Percy Greg.
• And if a question was made of his faithful dealing, he had his servants ready, that to his purpose he had brought up, that would avouch and swear to his book or word. - "The Works of John Bunyan Volume 3", John Bunyan.
• It was by faith in him, that all to succeed them should in this manner avouch the Lord. - "The Ordinance of Covenanting", John Cunningham.