/ˈkwaɪətn ||; ˈkwaɪətṇ/verb [T] to make sb/sth quiet 使安静；使平静 quieten (sb/sth) down to become quiet or to make sb/sth quiet （使…）安静下来，平静下来: When you've quietened down, I'll tell you what happened. 等你情绪安定下来，我会告诉你发生了什么事。