lay down the law

idiom

Definition of lay down the law

: to make a strong statement about what someone is or is not allowed to do The agreement lays down the law (to everyone) on what the group allows. When she came home after midnight, her father laid down the law: if she came home that late again, she would not be allowed to watch TV for a month.

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“Lay down the law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lay%20down%20the%20law. Accessed 3 Jun. 2020.

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