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in one's book

phrase

: in one's own opinion

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in one's blood
in one's book
in one's cups
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“In one's book.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20one%27s%20book. Accessed 12 Dec. 2025.

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Last Updated: - Definition revised
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