verb
to become more lively or cheerful
adverb
in a manner that makes someone more lively or cheerful
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After receiving positive feedback from her boss, she began to perk up and show more enthusiasm at work.
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I noticed that my friend started to perk up once she heard her favorite song playing on the radio.
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I'll bring some coffee to help you perk up before the meeting.
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The rainy weather seemed to perk up once the sun started to shine through the clouds.