student asking question

What does "open book" mean? Is it a common expression?

teacher

Native speaker’s answer

Rebecca

"Open book" is an expression that means someone is very honest about their life that their life or stories are easy to learn about and to understand. Ex: My aunt is an open book. She tells me about all of the things she has done wrong and how she learned from them. Ex: I'm an open book. It's much easier than trying to hide who I am.

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