(放心) feel at ease; be relieved; set one's mind at rest
She was relieved at the news.
听到这个消息, 他就安心了。
You just get better and don't worry.
希望你安心休养。
keep one's mind on one's work; work contentedly
安心工作
harbour evil intentions
安心不善
What is he up to?
他安的什么心?