To Vouch

1. To take responsibility for; to express confidence in; to witness; to obtest.
2. To warrant; to maintain by affirmations. Synonyms: attest, affirm, avouch
3. To back; to support; to confirm.
4. To call into court to warrant and defend, or to make good a warranty of title.
5. (obsolete)To call; to summon.
6. To bear witness; to give testimony or full attestation.
7. To call as a witness.
8. To assert; to aver; to declare.