Kashkin had made him out to be a hell of a fellow and Karkov had at first been insultingly polite and then, when Robert Jordan had not played at being a hero but had told a story that was really funny and obscenely discreditable to himself, Karkov had shifted from the politeness to a relieved rudeness and then to insolence and they had become friends.
There are no more uses of "discredit" in the book.
Show samples from other sources
She spoke only of her strengths, but others on her campaign staff worked to discredit her opponent.
Russian TV is famous for inventing stories to discredit those who disagree with Russian interests.