Pledge

Pledge
to promise seriously and publicly to do something

• pledge support: Britain, France, and Germany were among the countries pledging their support.
• pledge to do something:
  He has pledged to fight for a fairer system.
• pledge that:
  The President has pledged that putting the economy right will be his top priority.
• pledge someone/yourself to do something:
  They have pledged themselves to root out state corruption.

to promise a certain amount of money for a particular purpose

• The international community pledged $500 million for economic reconstruction.

to give something valuable to someone as a way of promising that you will pay them money later

• His home is pledged as security against the loans.