perk up
intransitive-verb
To become more cheerful or lively.
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She perked up when she heard the news.
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After a cup of tea, he started to perk up and became more talkative than before.
To make someone feel happier or more energetic.
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The good news perked her up immediately.
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A phone call from her friend perked her up after a long day at work and she felt refreshed.