Noah Webster's Dictionary 1. (v. t.) To appeal to; to cite or claim as authority. 2. (v. t.) To maintain a just or true; to vouch for. 3. (v. t.) To declare or assert positively and as matter of fact; to affirm openly. 4. (v. t.) To acknowledge deliberately; to admit; to confess; to sanction. 5. (n.) Evidence; declaration. Int. Standard Bible Encyclopedia AVOUCH a-vouch': In English Versions of the Bible only in Deuteronomy 26:17, 18, in the sense of "to confess," "avow," "publicly and solemnly declare." The Hebrew form is likewise unique (Hiph. of 'amar).