be an open book

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be an open book

1. To be easy to understand or decipher. I wish these legal contracts were an open book.
2. To act (or purport to act) honestly, with no secrets. Ask me anything, I'm an open book. Adam says he's an open book, but I've seen him sneaking out of his house late at night.
See also: book, open
References in periodicals archive ?
If anyone ever wants to talk to me about what happened I am an open book.
I am an open book," he said, adding, " I have not prevented anybody from looking at my conduct.
I am an open book, I don t try to hide anything, I m not trying to fool anybody.
He says he is on a "mission to find the truth" and is willing to take a lie-detector test, adding: "I have told the police from the beginning I am an open book.