You do something that makes other people respect or trust you less. "She saw her sister blot her copybook by being quoted in the press."

You disregard or ignore established rules or conventions."In times of crisis, sometimes you have to throw the rulebook out of the window and be flexible."

Is a person who likes to read books. “She is such a bookworm! She seems to have a new book every day!”

Punishing someone or calling them to account for their behaviour. "Bringing him to book is the only option to make him understand his actions are wrong."

You understand their thoughts or intentions easily. "She's an open book; you can read her like a book, and she'll tell you exactly what's on her mind."

A surprising or unexpected event. "Well, that's a turn-up for the books - I never thought he'd get the job!"

You charge or punish them to the full extent of the law or regulations. "If caught, they'll throw the book at him for breaking into the secure facility."

You are a mystery. It can also mean you are something that cannot be understood.

They are pleased/annoyed with you. "Noah is trying to be in the good books of his manager by working overtime."

Doing something by the books means you strictly follow the rules and guidelines. “My boss really likes to do things by the book.”

Are beginning to study. “I never even cracked a book open in my literature class, but I still got an A.”

Having a lot of academic knowledge learned from books and studying, but not necessarily knowing much about people and living in the real world ("street smart").

You begin to study in a serious and determined way. " I have to hit the books this weekend; I have two exams next week."