in someone's bad books
in (someone's) bad books
Having fallen out of favor with someone. I don't think I'll come to the party on Saturday, I'm in Jenny's bad books at the moment.
in someone's bad booksBRITISH, INFORMAL
If you are in someone's bad books, you have done something that has annoyed them. Sir John was definitely in the Treasury's bad books for incorrect thinking on economic prospects. Thomas gloomily speculated that he might be the next to be in Mrs Simpson's bad books.