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.
in my book
In my opinion; from my perspective. In my book, playing with character is more important than winning. You're OK in my book, kid.
in one's book
Fig. according to one's own opinion. He's okay in my book. In my book, this is the best that money can buy.
in my book
in my opinion; to me. in (one's) book
In one's opinion: In my book they both are wrong.