vouch

UK: vaʊtʃ | US: vaʊtʃ

Definition
  1. vi. to give a personal assurance or guarantee

  2. vt. to support or confirm the truth or validity of something

Structure
vou <call, summon (from Latin *vocare*)>
Etymology

The word "vouch" traces back to the Latin vocare ("to call"), which evolved into Old French vocher ("to summon or call as a witness"). In Middle English, it took on the sense of "to guarantee or affirm," reflecting the act of calling someone to testify or stand as a witness for the truth of a statement. The modern meaning retains this idea of personal assurance or confirmation.

Examples
  1. Can you vouch for his honesty?

  2. The lawyer will vouch that the document is authentic.

  3. No one could vouch for her whereabouts that night.

  4. I’ll vouch for the quality of this product.

  5. His reputation vouches for his credibility.