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English definition of “calm (sb) down”

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calm (sb) down

verb [T] uk phrasal verb with calm   /kɑːm/ us  
B2 to stop feeling upset, angry, or excited, or to stop someone feeling this way: She sat down and took a few deep breaths to calm herself down. She was angry at first but we managed to calm her down. Calm down, for goodness sake. It's nothing to get excited about!
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(Definition of calm (sb) down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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