pledge

nouns

a deposit of personal property as security for a debt
"his saxophone was in pledge"
is a type of (narrower)
any interest in a property that secures the payment of an obligation
someone accepted for membership but not yet fully admitted to the group
is a type of (narrower)
one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)
"only members will be admitted"; "a member of the faculty"; "she was introduced to all the members of his family"
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"

verbs

promise solemnly and formally
"I pledge that I will honor my wife"
is derived from
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"
is derived from
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"
is a type of (narrower)
give over to another for care or safekeeping
"consign your baggage"
bind or secure by a pledge
"I was pledged to silence"
is a type of (narrower)
bind by an obligation; cause to be indebted
"He's held by a contract"; "I'll hold you by your promise"