lay down the law
This page is about the idiom lay down the law
If you lay down the law, you tell people what they should do in a forceful and stern way.
- After we lost our third game in a row, our coach got really angry and laid down the law and said we had to try harder or we'd be out the door.
- Shelley's parents laid down the law after she got home late and grounded her for a month.
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Contributor: Matt Errey