in one's book

in one's book idiom
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.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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