noun
a word that functions as the name of something, such as a person, place, or thing
verb
a word used to describe an action, state, or occurrence
adjective
a word or phrase naming an attribute, added to or grammatically related to a noun to modify or describe it
adverb
a word that modifies a verb, adjective, or other adverb, typically answering the questions how, when, or where
preposition
a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause
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It is important to keep down noise levels in a library.
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Can you please keep down the volume on the TV?
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Hey, keep it down! You're being too loud.
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She struggled to keep down her emotions during the difficult conversation.