lay down the law
US /leɪ daʊn ðə lɔː/
UK /leɪ daʊn ðə lɔː/

1.
kuralları koymak, emir vermek
to tell people what they must do, without caring about their opinions
:
•
The new manager immediately laid down the law about punctuality.
Yeni yönetici dakiklik konusunda hemen kuralları koydu.
•
My parents always lay down the law when it comes to my curfew.
Ebeveynlerim sokağa çıkma yasağım konusunda her zaman kuralları koyar.