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”

A deposit of personal property as security for a debt.

“his saxophone was in pledge”

Someone accepted for membership but not yet fully admitted to the group.

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”

Bind or secure by a pledge.

“I was pledged to silence”

Give as a guarantee.

“I pledge my honor”