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English definition of “rule book”

rule book

noun [C, usually singular]    
the set of ideas or principles that control an organization , job , or activity : The industry rule book needs to be updated to meet new safety standards . He won promotions by delivering results without challenging the company rule book .
the way things are usually done in a particular activity , area of business , etc.: Designers threw out the rule book and layered pieces such as skirts over trousers .
(Definition of rule book noun from the Cambridge Business English Dictionary © Cambridge University Press)
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