PHRASAL VERB-ERG (使)安静;(使)平静下来 If someone or something quietens down or if you quieten them down, they become less noisy or less active. (使)安静;(使)平静下来 [mainly British]
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The labour unrest which swept the country last week has quietened down. [VERB PREP.]
上周席卷全国的劳工暴动已经平息了。
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Somehow I managed to quieten her down. [VERB noun PREP.]
我设法让她平静了下来。
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Tom's words before the match might also have quietened down our own supporters. [VERB PREP. noun]
汤姆赛前说的话可能也让我们自己的支持者平静了下来。
SYN calm someone down, comfort, soothe, subdue
in AM, usually use 美国英语通常用 quiet down