quieten down 变得安静
quieten the mind 平静心境
quieten the crowd 使人群安静下来
A: The crowd is getting very loud. We need to quieten them down.
A：人群变得非常吵闹。我们需要让他们安静下来。
B: Don't worry, the security guards will quieten the situation soon.
B：别担心，保安很快就会平息局面的。
1) 使安静
2) 使平静
3) 镇静
1. 使安静，使平静
verb
1. To make someone or something quiet or calm.
Synonym: calm, soothe, pacify