pledge

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

“signed a pledge never to reveal the secret”

propose a toast to

promise solemnly and formally

“I pledge that I will honor my wife”

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

“I pledged $10 a month to my favorite radio station”

a deposit of personal property as security for a debt

“his saxophone was in pledge”

bind or secure by a pledge

“I was pledged to silence”

give as a guarantee

“I pledge my honor”

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