5
lay down the law to tell someone what to do or how to behave in a way that shows that you expect them to obey you completely 发号施令 With kids like that you have to lay down the law and let them see you're serious. 对于那样的小孩你必须发号施令，让他们知道你是严肃认真的。
Synonyms and related words
To tell people what to do: order, order around, tell...