What is the meaning of pledged?

verb

• Promise solemnly and formally.
  • usage: "I pledge that I will honor my wife"
  • synonyms: pledge, plight
• Pay (an amount of money) as a contribution to a charity or service, especially at regular intervals.
  • usage: "I pledged $10 a month to my favorite radio station"
  • synonyms: pledge, subscribe
• Propose a toast to.
  • usage: "Let us toast the birthday girl"; "Let's drink to the New Year"
  • synonyms: toast, drink, pledge, salute, wassail
• Give as a guarantee.
  • usage: "I pledge my honor"
  • synonyms: pledge
• Bind or secure by a pledge.
  • usage: "I was pledged to silence"
  • synonyms: pledge

adjective

• Bound by or as if by an oath.
  • usage: "according to an early tradition became his sworn brother"; "sworn enemies"
  • synonyms: sworn