in your book

in (one's) book

According to one's opinion, judgment, or code of personal ethics. In my book, it's worse to run away from a fight than to start one. You kissed a girl, even though you have a girlfriend. That's cheating in my book, dude. That was some prank you pulled. You're OK in my book, kid.
See also: book

in your book

COMMON You use in my book to state your own belief or opinion about something. People can say what they like, but in my book he's not at all a bad chap. I wanted him to call the police. In my book a violent woman's just as dangerous as a violent man. Over-involvement with the client was a major crime in her book.
See also: book
References in classic literature ?
"I," said Don Quixote, "have some little smattering of Italian, and I plume myself on singing some of Ariosto's stanzas; but tell me, senor- I do not say this to test your ability, but merely out of curiosity- have you ever met with the word pignatta in your book?"