quieten down 变安静
quiet down 保持安静
suddenly quieted 突然安静下来
A: Why is the baby still crying?
A：为什么婴儿还在哭？
B: Don't worry, I quieted him down just now.
B：别担心，我刚才已经把他弄安静了。
1) 使人安静
2) 使事态平息
3) 平复情绪
1. 使安静，平息
verb
1. To make someone or something calm or silent.
Synonym: calm, soothe, pacify