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10 Useful English Idioms about Books

English has many idioms built around books. Their meaning cannot be guessed from the words, so learn them as fixed phrases: an open book, balance the books, by the book, read someone like a book.

  • CEFR B1
  • 8-question quiz
  • 2 exercises

“I can read you like a book.”

If you have ever come across this phrase while trying to learn English conversation, you likely found yourself confused and perplexed at its meaning. Perhaps you figured out it is an English idiom, or a phrase that has a unique meaning to it that cannot be understood from the words themselves. No matter if you are one of those people who find idioms amusing or utterly frustrating, they are without a doubt important to learn. So, what does “I can read you like a book” mean and what are some other useful English idioms about books?

Here’s a list of popular idioms about books as well as idiom examples for each of them:

1. To be an open book

To be an open book means you are a very open person who hides nothing from others. If people seek out information from you, you freely give it without hesitation. Examples:

“I thought it would be hard to get information from him, but he was an open book.”

“I am an open book, so ask me whatever you want!”

2. To balance the books

Balancing the books is the process where you ensure that the amount of money (personal or business) coming in and going out matches up to what your records show. You then make sure that balance matches what the bank says your balance is.

Examples:

“He balanced the books, and we are off this month. We will have to review all our finances and receipts and see where the mistake is.”

“Our accountant usually balances the books for us.”

3. You can’t judge a book by its cover

If you hear someone say this English idiom, they mean you can’t judge a person, experience, object, etc. just by what you see. It is most often used in situations where the person appears unintelligent, boring, or like they possess any other negative characteristics.

Examples:

“She doesn’t seem like she is the smartest, but you can’t judge a book by its cover.”

“I thought she was going to be a really boring person, but you can’t judge a book by its cover. She’s actually really fun to be with!”

4. To use every trick in the book

If you use every trick in the book, you have tried every possible way and method to do something, sometimes in a deceitful manner.

Examples:

“I used every trick in the book, but I couldn’t change his mind.”

“He used every trick in the book until he finally got what he wanted.”

5. The oldest trick in the book

The oldest trick in the book refers to a commonly used method to trick or deceive someone.

Examples:

“He told me that his dog ate his homework. That’s the oldest trick in the book.”

“You fell for that? That’s the oldest trick in the book!”

6. To crack a book [open]

If you crack a book [open], you are beginning to study.

Examples:

“I never even cracked a book open in my geography class, but I still got an A.”

“I need to crack open a book and review for the test.”

7. To have your nose in a book

To have your nose in a book usually means you are oblivious to what is happening in the world because you are so absorbed with what is happening in your book. It can also mean that someone is currently reading or that someone reads all the time. Each of the idiom examples below focuses on a different meaning.

Examples:

“I tried talking to John, but he had his nose buried in a book, so I couldn’t get his attention.”

“Shane has his nose in a book right now.”

“Ella always has her nose in a book.”

8. By the book

Doing something by the book means you strictly follow the rules and guidelines.

Examples:

“My boss really likes to do things by the book.”

“It is best to do things by the book, so we do not receive any penalties in the competition.”

9. Read someone like a book 

To read someone like a book means you know all there is to know about a person, especially their thoughts or reasons for doing something.

Examples:

“I knew you were going to do that because I can read you like a book.”

“I wasn’t surprised you felt that way. I can read you like a book.”

10. A closed book

The opposite of being an open book, if you are a closed book, you are a mystery. It can also mean you are something that cannot be understood. This English idiom can be used to describe people as well as topics.

Examples:

“I wish I could say I knew a lot about my grandfather, but unfortunately, he was a closed book.”

“Understanding physics will always be a closed book for me. It makes no sense.”

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Sources

Key vocabulary

WordMeaningExample
to be an open bookto be honest and share information freely; to hide nothingAsk me anything about the project. I'm an open book.
to balance the booksto check that the money coming in and going out matches the recordsOur accountant balances the books at the end of every month.
you can't judge a book by its coveryou can't know what someone or something is really like from how they lookThe office looked old, but you can't judge a book by its cover. The team was excellent.
to use every trick in the bookto try every possible method to get something, sometimes in a dishonest wayThe salesman used every trick in the book to close the deal.
the oldest trick in the booka very common and well-known way to fool someoneHe said his email didn't send. That's the oldest trick in the book.
to crack a book (open)to open a book and start studyingI need to crack a book before my certification exam.
to have your nose in a bookto be reading, often so much that you don't notice what is around youShe always has her nose in a book on the train to work.
by the bookexactly according to the rulesOur finance team does everything by the book.
to read someone like a bookto understand easily what someone is thinking or feelingMy manager can read me like a book. She knew I was nervous.
a closed booka person or subject you know nothing about or cannot understandTax law is a closed book to me.

Practice: 10 Useful English Idioms about Books

Work through the exercises, then test yourself with the quiz. Learn from your mistakes and try again as often as you like.

Exercises

Complete the idiom

Fill in the missing word or words to complete the book idiom.

  1. Don't worry about the audit. We do everything by the ______.

    We follow the rules exactly.

    Show answer

    book

  2. Before we close the month, we need to ______ the books.

    Check that income and spending match the records.

    Show answer

    balance

  3. My new colleague is very quiet, but you can't judge a book by its ______.

    Appearances can be misleading.

    Show answer

    cover

  4. "My phone died, so I couldn't call." That's the ______ trick in the book.

    A very common excuse.

    Show answer

    oldest

  5. I know you're upset. I can read you like a ______.

    I understand your feelings easily.

    Show answer

    book

  6. He never talks about his past. He's a ______ book.

    A mystery to others.

    Show answer

    closed

  7. She's an ______ book. She'll tell you exactly what she thinks.

    She hides nothing.

    Show answer

    open

  8. During lunch, Tom always has his ______ in a book.

    He is always reading.

    Show answer

    nose

Use the idiom in context

Write one sentence about work or daily life using each idiom. Compare yours with the model answer.

  1. to use every trick in the book

    Show answer

    We used every trick in the book to finish the report on time.

  2. to crack a book (open)

    Show answer

    I didn't crack a book all weekend, so I'm not ready for Monday's training.

  3. a closed book

    Show answer

    Marketing is a closed book to me. I only know accounting.

  4. by the book

    Show answer

    The new manager wants every expense report done by the book.

Quiz: 8 questions

1. What does it mean if someone is "an open book"?
2. Who usually "balances the books" in a company?
3. Choose the correct idiom: "He looks shy, but you can't judge a book by its ______."
4. "My dog ate my homework" is a classic example of...
5. Which sentence means "to do something exactly according to the rules"?
6. "I can read you like a book" means...
7. "Chemistry has always been a closed book to me." What does the speaker mean?
8. "I didn't ______ a book before the test, and I failed."

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