An open book
noun
A person, situation, or thing that is easy to understand or predict.
His thoughts and feelings are like an open book.
Often appears as...
- her life is an open book
- read him like an open book
Usage tips
Idiomatic
noun
A subject or situation that can be studied or examined freely or publicly.
The company's accounts were an open book.
Often appears as...
- the accounts were an open book
- the case is an open book
Usage tips
Technical
noun
A person, situation, or thing that is easy to understand or predict.
His thoughts and feelings are like an open book.
Often appears as...
- her life is an open book
- read him like an open book
Usage tips
Idiomatic
noun
A subject or situation that can be studied or examined freely or publicly.
The company's accounts were an open book.
Often appears as...
- the accounts were an open book
- the case is an open book
Usage tips
Technical
Definition 1 of 2
Pro Tip 1/3Predictable Personality
Refers to someone whose thoughts and actions are easy to guess.
As soon as he heard the news, I knew he would offer to help; he's an open book.
Pro Tip 2/3No Secrets
Describes someone who doesn’t hide their feelings or secrets.
You can ask her anything, she’s an open book.
Pro Tip 3/3Emotional Transparency
Indicates that a person's emotions are easy to read and understand.
After the match, his disappointment was an open book.
Pro Tip 1/3Predictable Personality
Refers to someone whose thoughts and actions are easy to guess.
As soon as he heard the news, I knew he would offer to help; he's an open book.
Pro Tip 2/3No Secrets
Describes someone who doesn’t hide their feelings or secrets.
You can ask her anything, she’s an open book.
Pro Tip 3/3Emotional Transparency
Indicates that a person's emotions are easy to read and understand.
After the match, his disappointment was an open book.
Pro Tip 1/3Predictable Personality
Refers to someone whose thoughts and actions are easy to guess.
As soon as he heard the news, I knew he would offer to help; he's an open book.
Pro Tip 2/3No Secrets
Describes someone who doesn’t hide their feelings or secrets.
You can ask her anything, she’s an open book.
Pro Tip 3/3Emotional Transparency
Indicates that a person's emotions are easy to read and understand.
After the match, his disappointment was an open book.
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