by the book Meaning If you do something by the book, you do | Learn English Idioms Land

by the book

Meaning
If you do something by the book, you do it strictly according to the rules or the official procedures.

For example

The match officials in the golf tournament acted strictly by the book when they disqualified a player for marking down the wrong score on his score card.
The embassy officials process visa applications by the book these days, so it's harder to get one than it was when they weren't so strict.
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