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Meaning of closed book in English

  1. Pronunciation

    US accent

    How to pronounce closed book in American English, in context ▾
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    UK accent

    How to pronounce closed book in British English, in context ▾
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  1. Noun

    closed book

    Definitions

    1. something that baffles understanding and cannot be explained

    Examples

    • « how it got out is a mystery »
    • « it remains one of nature's secrets »

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