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Region: General | Usage example: He does everything by the book.

By the book

Meaning

Follow the rules exactly.

Usage

Used when someone strictly adheres to procedures.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Refers to following the official manual or guide.

Used in workplaces since the early 20th century.

Related Idioms

Play by the book

Follow the rules exactly

You can't judge a book by its cover

Appearances can be deceiving.

Throw the book at

Punish severely by applying all available rules.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.