pledge in WordNet English dictionary

1. 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"
   assurance  pledge 
   
2. a drink in honor of or to the health of a person or event
   pledge  toast 
   
3. someone accepted for membership but not yet fully admitted to the group
   pledge 
   
4. a deposit of personal property as security for a debt
   "his saxophone was in pledge"
   pledge 
   

1. propose a toast to
   "Let us toast the birthday girl!"; "Let's drink to the New Year"
   toast  drink  pledge  salute  wassail 
   
2. promise solemnly and formally
   "I pledge that I will honor my wife"
   pledge  plight 
   
3. bind or secure by a pledge
   "I was pledged to silence"
   pledge 
   
4. give as a guarantee
   "I pledge my honor"
   pledge 
   
5. 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"
   pledge  subscribe