transitive verb \ə-ˈvau̇ch\. Definition of AVOUCH. 1. : to declare as a matter of fact or as a thing that can be proved : affirm. 2. : to vouch for : corroborate. 3. a : to acknowledge (as an act) as one's own. b : confess, avow. Examples of AVOUCH ...
tr.v. a·vouched, a·vouch·ing, a·vouch·es. 1. To declare the provable truth or validity of; affirm: She avouched that she herself was innocent. 2. To corroborate or confirm; vouch for: Has this report been avouched? 3. To accept responsibility for ...