pledge - noun

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

pledge - verb

• 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

pledge - thesaurus

assurance   drink   plight   salute   subscribe   toast   wassail