Inflected forms: 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 (an action, for example); acknowledge. 4. To avow; confess.
ETYMOLOGY:
Middle English avouchen, to cite as a warrant, from Old French avochier, from Latin advocre, to summon. See advocate.