avouch

How many young women in Boston can avouch for the truth of this statement?

Upon which principle I also avouch all Mr. T.'s charges, as I hear them and consent to their publication.

"'And which shall find its way thither, if thou dost not avouch a fable," replied the king.

Taken together, they avouch a personality that needs only opportunity to insure itself lasting fame.

I say that it was the act of a rebel, and will avouch my words against you, though the whole colony were at your back.