vouches Definition

vouch
verb vouches, vouched, vouching

intr
1. To give a firm assurance or guarantee of their authenticity, trustworthiness, etc.

Thesaurus: verify, affirm, attest, confirm, assert, testify, endorse.
Form: vouch for someone (usually)
Form: vouch for something
2. To give (evidence) in support of a statement, assertion, etc.

Etymology: 16c in these senses; 14c in legal sense ‘to summon': from French voucher to call upon to defend.