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closed book meaning and definition

Definition and meaning of closed book at MeaningMonkey.org. closed book meaning and definition in the English Dictionary.

CLOSED BOOK noun

Definition of closed book (noun)

  1. something that baffles understanding and cannot be explained
    • "how it got out is a mystery"; "it remains one of nature's secrets"
    • synonyms: enigma, mystery, secret
Source: Princeton University Wordnet
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