write the book on


Also found in: Dictionary.

wrote the book on (something)

To be well known for being extremely experienced in or knowledgeable about something; to be renowned as an expert in something; to know nearly everything about something. The phrase has become so cliché that it is often used after the word "literally" to describe someone who has actually written a book about a certain topic. This lady wrote the book on modern sound design, so I can't wait to work with her in the recording studio. He literally wrote the book on such trade wars, which was published shortly after his second term as president.
See also: book, on, wrote

write the book on

To be the preeminent practitioner of or expert in (something).
See also: book, on, write