What is another word for by book?
Pronunciation: [ba͡ɪ bˈʊk] (IPA) 
The phrase "by book" means to follow the rules exactly as they are written. There are several synonyms for this phrase, such as "by the letter," "by the rules," "by the book," and "by the law." These phrases all imply strict adherence to established guidelines or regulations. These synonyms are commonly used in legal and academic settings where procedures must be followed rigorously. While following the rules precisely may sometimes be seen as inflexible or uncompromising, in many cases, it is necessary to ensure fairness and equality for all involved parties. Therefore, these synonyms hold great importance in our daily lives.
