the couple's unorthodox marriage is definitely a closed book to those outside of the relationship
Recent Examples on the WebAnd there’s reason to believe that Kirchick sees this history as a closed book, a chapter that now belongs to the past.
Samuel Clowes Huneke, The New Republic, 8 June 2022 Readings of Alwyn as a closed book could be down to him being interviewed by people who aren’t used to encountering his English sensibility.
Louis Staples, Harper's BAZAAR, 17 May 2022 Tightly gathered, accordion-like pastry sheets fold neatly onto themselves, resembling the edge of a closed book.
Vivian Song, Robb Report, 1 June 2021
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'closed book.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.