<p><strong>Verb</strong></p><ul><li>(used without object)</li><li>to support as being true, certain, reliable, etc. (usually followed by for): Her record in office vouches for her integrity.</li><li>to attest; guarantee; certify (usually followed by for): to vouch for someone in a business transaction.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object)</li><li>to sustain or uphold by, or as if by, practical proof or demonstration.</li><li>(formerly) to call or summon (a person) into court to make good a warranty of title.</li><li>to adduce or quote in support, as extracts from a book or author; cite in warrant or justification, as authority, instances, facts, etc.</li><li>Archaic: to warrant or attest; to support or authenticate with vouchers.</li><li>Archaic: to declare as with warrant; vouch for.</li><li>Obsolete: to call or take as a witness.</li></ul><p><strong>Noun</strong></p><ul><li>Obsolete: a vouching; an assertion.</li><li>a formal attestation; a supporting warrant.</li></ul>