lay down the law
US /leɪ daʊn ðə lɔː/
UK /leɪ daʊn ðə lɔː/
1.
立下规矩, 发号施令
to tell people what they must do, without caring about their opinions
:
•
The new manager immediately laid down the law about punctuality.
新经理立即立下规矩，要求大家准时。
•
My parents always lay down the law when it comes to my curfew.
我的父母在我的宵禁问题上总是立下规矩。