English version

be an open book

From Longman Dictionary of Contemporary Englishbe an open bookbe an open bookKNOW somethingto be something that you know and understand very well The natural world was an open book to him. open
Examples from the Corpus
be an open bookI'd always thought of Jeff as an open book.To them my future was an open book.Our foreign dealings are an open book generally a check book.
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