by the book

Cultural  

1. According to established rules: “The inspector will be visiting the factory today, so let's make sure we do everything by the book.”

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by the book Idioms  

1. Strictly according to the rules, as in Our trip leader is going by the book, allowing us to wander off only for short periods. Shakespeare already used the term figuratively in Romeo and Juliet (1:5): “You kiss by the book.” Also see by the numbers.

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Example Sentences

See Examples For:

by the book

A balanced portfolio in your mid-70s means allocating 40% to 50% to bonds, if you’re playing your septuagenarian retirement planning by the book.

From MarketWatch ● Jun. 2, 2026

Those who have worked alongside him describe him as a "by the book man" who has had a distinguished career in public service and is "diligent about processes and acting properly."

From BBC ● Apr. 20, 2026

There is a second, diffuse—seemingly unintentional—sadness revealed by the book that is something closer to cultural or civilizational loss.

From The Wall Street Journal ● Feb. 23, 2026

The company, which underwent several acquisitions, including by the book retailer Barnes & Noble, was later renamed GameStop.

From Los Angeles Times ● Jan. 16, 2026

It was on the back of the checkout card with the other kids who’d been chosen by the book.

From "The Way to Rio Luna" by Zoraida Cordova

Related Words

• binding
• demanding
• draconian
• exacting
• forceful
• harsh
• inflexible
• ironclad
• rigorous
• severe
• stiff
• strict
• tough