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English definition of “pledge”

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pledge

noun [C] uk   /pledʒ/ us  
a serious or formal promise, especially one to give money or to be a friend, or something that you give as a sign that you will keep a promise: [+ to infinitive] All the candidates have given/made pledges not to raise taxes if they are elected. Thousands of people made pledges (= promised to give money) to the charity campaign. I give you this ring as a pledge of my everlasting love for you.
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pledge

verb [T] uk   /pledʒ/ us  
to make a serious or formal promise to give or do something: We are asking people to pledge their support for our campaign. If you join the armed forces, you have to pledge allegiance to your country. So far, $50,000 has been pledged (= people have promised to pay this amount) in response to the appeal. [+ to infinitive] Both sides have pledged to end the fighting. I've been pledged to secrecy.
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(Definition of pledge from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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