A pledge is basically very serious formal promise. You can pledge allegiance to your country, you can pledge to keep a secret, and you can pledge a sum of money to a cause.
Pledge can be used as both a noun and a verb. As a noun, it can be a solemn promise you've made. Or even the person who makes that promise, like the freshman pledges who take an oath to join a fraternity in college. As a verb, it describes the act of promising. “I pledge you, I pledge myself, to a new deal for the American people,” vowed Franklin D. Roosevelt, the 32nd President of the United States.
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nv |
a binding commitment to do or give or refrain from something
promise solemnly and formally
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2 |
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a deposit of personal property as security for a debt
give as a guarantee
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3 |
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a drink in honor of or to the health of a person or event
propose a toast to
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4 |
v |
pay (an amount of money) as a contribution to a charity or service, especially at regular intervals
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