pledge

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

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; "an assurance of help when needed"; "signed a pledge never to reveal the secret"

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"

propose a toast to; "Let us toast the birthday girl!"; "Let's drink to the New Year"

give as a guarantee; "I pledge my honor"

bind or secure by a pledge; "I was pledged to silence"