avouch

/əˈvaʊtʃ/
verb
  1. To assert or affirm something as true; to declare confidently.
    • He avouched his loyalty to the company during the meeting.
    • The witness avouched the accuracy of her statement in court.
    • The ancient text avouches the king's bravery in battle.
  2. To guarantee or vouch for something or someone.
    • I can avouch for his honesty; I've known him for years.
    • She avouched that the funds would be returned by the end of the month.
    • The merchant avouched the quality of the goods.
Antonyms
What does "avouch" mean? | whatsthatwordmean | whatsthatwordmean