Closed book =  When you do not know anything about a person.

Example: That guy is closed book. He is always silent.

Opened book = When you know a lot about a person.

Example: He does not care what people think about him because he is an opened book.

Book smart = Someone who has knowledge because they study or read.

Example: My sister is booksmart, but she has very little practical knowledge.

Bookworm = Someone who loves to read books.

Example: My cousin is such a bookworm. He is always at the library.

You can’t judge a book by its cover = This expression is made when you say something about a person, but you do not know a lot about him/her.

Example: In the class everyone thought that Kim was a quiet person, but one day, one of her classmates saw her dancing like an expert at the nightclub.

Every trick in the book = You know many ways of getting what you want.

Example: He tried every trick in the book to get her to sign the contract.

He tried every trick in the book to get her to marry him

In my book = Another way of saying in my opinion.

Example: In my book John is a terrible soccer player.

                In my book the USA is a fantastic country.

In someone’s good/bad books = When someone is pleased or not pleased with you.

Example: After Carlos started getting good grades, he was in his mother’s good books.

Example 2: After her husband started going out with other women, he was in his wife’s bad book.

Off the books = When something is not included, not in the official record.

Example: My brother works in a store, but he is not paid by check. He gets paid off the books.

One for the record books = You can say the snowstorm gave us a lot of snow, and it was one for the records.

This means that a record was set with all the snow that fell, down.

Read my lips =  This means listen to me.

The oldest trick in the book = When the student tells the teacher, the dog ate my homework that is the oldest trick in the book.