in one's book

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Refers to a hypothetical book or list of one's opinions and beliefs.
Slang from the mid-1900s.[1]

Prepositional phrase[edit]

in one's book

  1. (slang) In one's opinion.
    • 1973, QST, Volume 57, Issue 2, page 87,
      Is this "the field?" Not in our book, it isn't.
    • 1975 Feb 8, Kevin O'Donohue, Stan Clark, Brian McClenaughan, Frank Jeffcoat, Four Broadcasters Compare U.S. Radio with Australian Radio - The Knockout Blow, in Billboard, page A-7,
      [Jeffcoat:] I'll qualify that in a moment, but in my book I think when it comes to sheer professionalism, there's nothing quite like an American broadcaster.
    • 1978, William James, Frederick Burkhardt, Fredson Bowers, Ignas K. Skrupskelis, Essays in Philosophy, page 66,
      My solution, or rather Stumpf's (for in my book I am but the humble follower of the eminent Munich psychologist), was to take neither of these objectionable alternatives, [] .
    • 2007, Ralph A. Gessner, Deep in My Heart, page 105,
      That's taking things way too far in my book.
  2. Used other than with a figurative or idiomatic meaning: see in,‎ one's,‎ book.

Usage notes[edit]

  • Only the pronoun form one's changes to match the subject of the phrase.



  1. ^ Christine Ammer, The American Heritage Dictionary of Idioms, page 328