( rule books)
1.
A rule book is a book containing the official rules for a particular game, job, or organization.
...one of the most serious offences mentioned in the Party rule book.
N-COUNT
2.
If you say that someone is doing something by the rule book , you mean that they are doing it in the normal, accepted way.
This was not the time to take risks; he knew he should play it by the rule book.
N-COUNT : the N