Closed book and Case

Related terms

Closed book noun - Something hard to understand or explain.

Usage example: the couple's unorthodox marriage is definitely a closed book to those outside of the relationship

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Case and closed book are semantically related. In some cases you can use "Case" instead a noun phrase "Closed book".

Case noun - Something that encloses another thing especially to protect it.

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Closed book and case are semantically related. Sometimes you can use "Closed book" instead a noun "Case".

Nearby Words: cased, casing, casework

Cite this Source

Case and Closed book. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/closed_book/case

Closed book & Case. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/closed_book/case>.

Case or Closed book. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/closed_book/case.

Google Ngram Viewer shows how "closed book" and "case" have occurred on timeline