pledge

A solemn binding promise to do, give, or refrain from doing something.

Something given or held as security to guarantee payment of a debt or fulfillment of an obligation.

The condition of something thus given or held.

Delivery of goods or personal property as security for a debt or obligation.

The contract or transaction stipulating or involving such delivery.

A token or sign.

A person who has been accepted for membership in a fraternity or similar organization and has promised to join but has not yet been initiated.

The act of drinking in honor of someone; a toast.