open book Meaning in the Cambridge English Dictionary
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Meaning of “open book” in the English Dictionary

"open book" in British English

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open booknoun

uk   us  
be an open book If someone is an ​openbook, it is ​easy to ​know what they are ​thinking and ​feeling.
(Definition of open book from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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having male and female students being taught together in the same school or college rather than separately

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