By the book

For chrcking the transcript: https://www.buzzsprout.com/2379282

By the book 

If someone does something “by the book,” it means they follow all the rules, policies, or procedures exactly—with no shortcuts or exceptions. 

Examples:

1- Our accountant is extremely careful—she does everything by the book, down to the last cent.

2- I tried to renew my passport early, but the clerk refused. He said, ‘Sorry, we have to do this by the book.

Transcript

Hello and welcome to Daily English! today’s expression is “by the book.” Once again: by the book. Can you guess what it means? Let’s try two quick hints: You’re driving with your very careful friend. They stop at every sign, drive exactly the speed limit, and never touch their phone. You might say, “Wow, you really drive by the book.”
A manager won’t let anyone leave even one minute early. Everything has to be done exactly as written. Yep—he’s doing things by the book.
So what does this expression mean? If someone does something “by the book,” it means they follow all the rules, policies, or procedures exactly—with no shortcuts or exceptions. They do things properly, officially, and carefully, often even when others might bend the rules a little.

Examples: "Our accountant is extremely careful—she does everything by the book, down to the last cent."
"I tried to renew my passport early, but the clerk refused. He said, ‘Sorry, we have to do this by the book.’"
"My little brother plays board games by the book—and gets mad if you even touch two cards at once."

This expression is sometimes a compliment—if someone is honest and careful. But sometimes it’s a little negative, if someone is too strict or inflexible.

Are you someone who does things by the book, or do you prefer to find your own way? Maybe it depends on the situation. Share your story please.