verb
to make or become fresh or fresher
adverb
freshen can also be used as an adverb to describe how something is done
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It is recommended to freshen up the room with some air freshener.
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I need to freshen up my wardrobe with some new clothes.
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Let's freshen up this party with some cool music.
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The new manager plans to freshen up the company's image with a rebranding campaign.