lay down the law

US /leɪ daʊn ðə lɔː/
UK /leɪ daʊn ðə lɔː/
"lay down the law" picture
1.

規則を定める, 厳しく指示する

to tell people what they must do, without caring about their opinions

:
The new manager immediately laid down the law about punctuality.
新しいマネージャーはすぐに時間厳守について規則を定めた
My parents always lay down the law when it comes to my curfew.
私の両親は門限に関してはいつも規則を厳しく定める