1. 保证；诺言；誓言
    When someone makes a pledge, they make a serious promise that they will do something.

    e.g. The meeting ended with a pledge to step up cooperation between the six states of the region.
           会议以承诺加快这一地区六国间的合作而结束。
    e.g. ...a £1.1m pledge of support from the Spanish ministry of culture.
           来自西班牙文化部110万英镑的资助许诺

2. 保证，许诺，发誓（做）；保证给予
    When someone pledges to do something, they promise in a serious way to do it. When they pledge something, they promise to give it.

    e.g. Mr Dudley has pledged to give any award to charity...
           达德利先生已承诺将任何所获的损害赔偿额都捐给慈善机构。
    e.g. Philip pledges support and offers to help in any way that he can...
           菲利普保证给予支持，并主动提出尽其所能提供帮助。

3. 许诺拨（款）；许诺给予
    If you pledge a sum of money to an organization or activity, you promise to pay that amount of money to it at a particular time or over a particular period.

pledge

    e.g. The French President is pledging $150 million in French aid next year...
           法国总统许诺为法国明年的援助经费拨款1.5亿美元。
    e.g. The government has now pledged £170m over the next six years for improving primary care.
           为了改善初级卫生保健工作，政府已承诺在未来6年内拨款1.7亿英镑。

4. 使保证，使许诺，使发誓（遵循或支持）
    If you pledge yourself to something, you commit yourself to following a particular course of action or to supporting a particular person, group, or idea.

pledge

    e.g. The President pledged himself to increase taxes for the rich but not the middle classes...
           总统保证增加对富人而非中产阶级的税收。
    e.g. Tony Cottee has pledged himself to Everton Football Club for another three years...
           托尼·科蒂已答应同埃弗顿足球俱乐部再续约3年。

5. 用…抵押；以…典押
    If you pledge something such as a valuable possession or a sum of money, you leave it with someone as a guarantee that you will repay money that you have borrowed.

pledge的近义词

    e.g. He asked her to pledge the house as security for a loan.
           他要她拿房子来抵押贷款。