someone's word is law
idiom
—used to say that other people must do what someone says
He'll listen to suggestions, but in the end, his word is law.
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“Someone's word is law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/someone%27s%20word%20is%20law. Accessed 22 Jul. 2025.
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Merriam-Webster unabridged
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