VOUCH, verb intransitive To bear witness; to give testimony or full attestation. I canot vouch for the truth of the report. He declares he will not believe her, till the elector of Hanover shall vouch for the truth of what she so solemnly affirmed. VOUCH, noun Warrant; attestation.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI