verb
to make a solemn declaration or promise
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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As a public official, she was sworn to uphold the laws of the land.
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I was sworn to secrecy about the surprise party.
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We were sworn to keep our lips sealed about the prank we pulled.
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He was sworn to protect his little sister no matter what.