by the book

💡 Meaning

To do something strictly according to the rules or official procedures.

규칙이나 공식 절차에 따라 엄격하게 무언가를 하는 거예요.

🧠 Memory Hook

Imagine a thick rulebook sitting open on a desk. Someone is following every single line, one step at a time, without skipping anything. Every action is approved by the book.