transitive. To confirm or validate (an agreement, one's faith, etc.); to pledge or promise solemnly. Compare fasten, v. 1a. Obsolete.

transitive. To guarantee, give a solemn assurance of; (also) to promise, or undertake to give.

transitive. To guarantee. (a thing to a person); to promise as a thing that may be depended on. Obsolete.

To guarantee (a thing) to a person; to warrant (a fact). Const. to or dative. Obsolete.

transitive. To vouch to the certainty of, vouch for, guarantee.

transitive. To confirm, to guarantee or ensure the fulfilment of (a purpose, hope, etc.). Obsolete.

To grant (a charter, etc.) under one's seal; †figurative to give (testimony, a promise, etc.) in an authoritative manner or with solemn pledges of…

To guarantee or promise that. Obsolete.

To promise under guarantees.