by the book prepositional phrase 2by-the-book adjective 1forms 2 prepositional phrase2 •In a manner which strictly adheres to rules, legal requirements, or official procedures.As far as he is concerned, he umpired by the book. — 2006 •In a manner which appears too studied, ritualized, and therefore artificial.Romeo: Sin from thy lips? O trespass sweetly urged! Give me my sin again. They kiss again. Juliet: You kiss by th' book. — 1591 by-the-book adjective1 •Strictly adhering to rules, legal requirements, or official procedures.Given the troubled Bayou State's long history of rogues and demagogues, the most unusual thing about Gov. Jindal may be his record of by-the-book ethics. — 2007 formsmore by-the-book · most by-the-book