Pledge

a deposit of personal property as security for a debt

someone accepted for membership but not yet fully admitted to the group

a drink in honor of or to the health of a person or event

a binding commitment to do or give or refrain from something

promise solemnly and formally

pay (an amount of money) as a contribution to a charity or service, especially at regular intervals

propose a toast to

give as a guarantee

bind or secure by a pledge