Be in their bad books - Idioms by The Free Dictionary
be in (someone's) bad books (redirected from be in their bad books)
be in (someone's) bad books
To have fallen out of favor with someone. I don't think I'll come to the party on Saturday because I'm in Jenny's bad books at the moment.
be in/get into somebody’s ˈgood/ˈbad books (informal) have/not have somebody’s favour or approval: I’m in his bad books at the moment because I accidentally broke the window. ♢ ‘Why are you cleaning her shoes?’ ‘I’m trying to get into her good books!’