in somebody's book

in (one's) book

According to one's opinion, judgment, or values. 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. You proved you can handle yourself in a scrap. You're OK in my book, kid.
See also: book
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

in somebody’s book

(spoken) in somebody’s opinion; according to somebody’s judgement: They took the car away without asking me, and in my book that’s theft.
See also: book
Farlex Partner Idioms Dictionary © Farlex 2017
See also: