avouch /əˈvaʊt͡ʃ/verb 4noun 1forms 6 verb4 •To declare freely and openly; to assert.If this which he avouches does appear, There is nor flying hence nor tarrying here. — 1606 •To confirm or verify, to affirm the validity of. •To acknowledge deliberately; to admit; to confess; to sanction.[…] send me that hag hither; she shall avouch what it was that she hath given to the wretch Dryfesdale, or the pilniewinks and thumbikins shall wrench it out of her finger-joints. — 1820 •To appeal to; to cite or claim as authority.And for proofe of their opinion they avouch many successions of authorities that no fee simple should passe before the condition performed. — 1628 noun1 •(no longer used) evidence; declarationBefore my God, I might not this believe Without the sensible and true avouch Of mine own eyes. — 1599 formsavouched · avoucht · avouching · avouches · avoucheth · avouchest