noun
a word that represents a person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The thief broke into the mansion in the dead of night.
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We decided to go for a walk in the dead of night.
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Let's sneak out and meet at the park in the dead of night.
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The idea came to me in the dead of night, when all was quiet and still.