Definition of 'closed book'
Example sentences containing 'closed book'
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That part of her life was a closed book and to open it would cause her terrible distress. Times, Sunday Times (2013)Yet in one respect he remained a closed book: his personal politics he kept to himself. Times, Sunday Times (2011)
Trends of 'closed book'
Used Rarely. closed book is in the lower 50% of commonly used words in the Collins dictionary
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Definition of closed book from the Collins English Dictionary