寫下來的規則，以及照著它做
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book of rules · noun
A book that holds the rules of a job, a sport, or a game, so that anyone taking part can look up what is allowed and what is not.
規則手冊
You can picture a rulebook as the one object that settles an argument: a book on the shelf or in the game box, with the rules of a job, a sport or a game printed inside, that anyone can open and point at.
rulebook 可以想成「吵起來時被拿出來的那一本」。裡面印著一份工作、一種運動、一個遊戲的規則。它的力量不在厚，而在「翻得到」。規則白紙黑字，誰都不必比記性。從這個畫面往外走，go by the rulebook 就是「完全照書上那一行做」。
From the word’s history
The word is simply rule + book, so the modern meaning sits right on the surface: the book where the rules are.
資料上的字源就是 rule（規則）＋ book（書）。所以今天的意思跟字面幾乎重疊：放規則的那本書。也因為這樣，這個字沒有需要額外記的轉折。
Wiktionary, "rulebook"
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