simmer down
phrasal verb with simmer verb uk/ˈsɪm.ər/ us/ˈsɪm.ɚ/
informal
（怒火或激动的情绪）平息，冷静下来，平静下来
to become less angry or excited about something
Come on kids! Simmer down and get on with your work! 快点儿，孩子们！安静下来开始做功课！
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