PHRASAL VERB-ERG (使)安静;(使)平静下来 If someone or something quiets down or if you quiet them down, they become less noisy or less active. (使)安静;(使)平静下来 [mainly US]
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Once the vote was taken, things quieted down quickly. [VERB PREP.]
一旦投完票，事情便很快平息了下来。
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Try gradually to quiet them down as bedtime approaches. [VERB noun PREP.]
临近就寝的时候，要尽量让他们渐渐安静下来。
in BRIT, usually use 英国英语通常用 quieten down