Vouch

1. n. Warrant; attestation.
2. v. t. To call; to summon.
3. v. t. To call upon to witness; to obtest.
4. v. t. To warrant; to maintain by affirmations; to attest; to affirm; to avouch.
5. v. t. To back; to support; to confirm; to establish.
6. v. t. To call into court to warrant and defend, or to make good a warranty of title.
7. v. i. To bear witness; to give testimony or full attestation.
8. v. i. To assert; to aver; to declare.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.