/vowch/ , v.i.
1. to support as being true, certain, reliable, etc. (usually fol. by for ): Her record in office vouches for her integrity.
2. to attest; guarantee; certify (usually fol. by for ): to vouch for someone in a business transaction.
v.t.
3. to sustain or uphold by, or as if by, practical proof or demonstration.
4. (formerly) to call or summon (a person) into court to make good a warranty of title.
5. to adduce or quote in support, as extracts from a book or author; cite in warrant or justification, as authority, instances, facts, etc.
6. Archaic. to warrant or attest; to support or authenticate with vouchers.
7. Archaic. to declare as with warrant; vouch for.
8. Obs. to call or take as a witness.
n. Obs.
9. a vouching; an assertion.
10. a formal attestation; a supporting warrant.
[ 1275-1325; ME vouchen vo ( u ) cher, OF avochier advocare; see ADVOCATE ]