Meaning:- If you do something by the book, you do it exactly as the rules tell you.
Example sentence:
Your reputation will be discredited if you don't go by the book. If I were you, I'd follow the rules strictly.
Questions for you to answer:
- Do you always go by the book, or do you sometimes break the rules?
- In which situations do you think it's necessary to go by the book?
- When did you last regret not going by the book?
- What do you think is the origin of the idiom? What 'book' does it probably refer to?