Word.ws English Dictionary

in book

in book prepositional phrase: of a chess player: following a main line ("a standard sequence of opening moves considered to be best play").

Prepositional phrase

  1. (uncommon) Of a chess player: following a main line ("a standard sequence of opening moves considered to be best play").
    • The Sicilian opening was wild, but the speed of play made it clear both players were "in book", up to a point.2022 January 21, Colin McGourty, “Tata Steel 5: Rapport & Mamedyarov hit the front”, in chess24, archived from the original on 19 May 2022
    • Wesley So had prepared a line with a temporary pawn sacrifice against Praggnanandhaa and both players appeared to be in book for a long time.2023 January 19, Mark Crowther, “Giri overtakes Abdusattorov in a dramatic final round of the Tata Steel Masters to grab his first title”, in The Week in Chess, archived from the original on 01 Feb...
    Antonyms:
    out of book

Antonyms of in book

Questions about in book

What does in book mean?
In book means of a chess player: following a main line ("a standard sequence of opening moves considered to be best play").
What part of speech is in book?
In book is a prepositional phrase.

Words near in book in the dictionary

  1. in between times
  2. in bits
  3. in black and white
  4. in blood
  5. in bloom
  6. in book
  7. in brief
  8. in broad daylight
  9. in buckets
  10. in business
  11. in cahoots

Source and license

Adapted from Wiktionary: in book (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “in book.” Word.ws, https://word.ws/in_book. Based on Wiktionary, CC BY-SA 4.0.