wrote the book on

idiom

Definition of wrote the book on

informal
used to say that someone is an expert on a particular subjectShe wrote the book on long-distance swimming.

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“Wrote the book on.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/wrote%20the%20book%20on. Accessed 26 Nov. 2020.

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