lay down the law
成語所屬單字law
lay down the law — 慣用語
1. To tell someone forcefully what they must or must not do.
1.慣用語
釋義
嚴厲規定
To tell someone forcefully what they must or must not do.
例句
My boss laid down the law about using phones during work hours.
Grandma laid down the law: no snacks before dinner.