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in one's book

Idioms  

  1. According to one's opinion or way of thinking. For example, In my book he's a wonderful father. This expression alludes to a book containing a personal list of some kind. [Slang; mid-1900s] Also see black book.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.