Definition of “be in sb's good/bad books” - English Dictionary

british dictionary

“be in sb's good/bad books” in British English

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be in sb's good/bad books

C2 If you are in someone's good/bad books, they are pleased/not pleased with you:

He's in Melanie's bad books because he arrived two hours late.
I cleaned the bathroom yesterday so I'm in Mum's good books.

(Definition of “be in sb's good/bad books” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)