Definition of in someone's bad or good books in English:

in someone's bad (or good) books

In disfavour (or favour) with someone: you could say he is in my bad books
More example sentences
  • They say: ‘Let's try and be in their good books.’
  • He's back in their good books, so his odds remain long.
  • Ministers and officials in the state see to it that they stay in their good books.
See parent entry: book

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope