verb
to make a solemn declaration or statement, often invoking a deity or sacred object as witness
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I swear to tell the truth, the whole truth, and nothing but the truth.
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I swear I saw a UFO last night, but no one believes me.
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I swear that new restaurant is bomb, you have to try it.
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I swear, if I have to deal with one more rude customer today, I'm going to lose it.