動詞 pledge:

1. promise solemnly and formally
   同義詞：pledge, plight
2. pay (an amount of money) as a contribution to a charity or service, especially at regular intervals
   同義詞：pledge, subscribe
3. propose a toast to
   同義詞：toast, drink, pledge, salute, wassail
4. give as a guarantee
   同義詞：pledge
5. bind or secure by a pledge
   同義詞：pledge