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1. Bound by or as if by an oath
   - sworn

1. Promise solemnly and formally
   "I pledge that I will honour my wife"
   - plight
    
2. Pay (an amount of money) as a contribution to a charity or service, especially at regular intervals
   "I pledged $10 a month to my favourite radio station"
   - subscribe
    
3. Propose a toast to
   - toast, drink, salute, wassail [archaic]
    
4. Give as a guarantee
   "I pledge my honour"
    
5. Bind or secure by a pledge
   "I was pledged to silence"

See also: committed, pledger

Type of: assure, bind, charge, consign, donate, fete, fête, hold, honor [US], honour [Brit, Cdn], obligate, oblige, promise, reward

Encyclopedia: Pledge