noun
a word used to identify any of a class of people, places, or things
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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The vintage car has been put in mothballs until it can be fully restored.
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My old skateboard is just sitting in mothballs in the garage.
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I heard that project has been in mothballs for months now.
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After his injury, his dreams of becoming a professional athlete were put in mothballs.