Blessed be heaven! for by means of this history of your noble and genuine chivalrous deeds, which you say has been printed, the countless stories of fictitious knights-errant with which the world is filled, so much to the injury of morality and the prejudice and discredit of good histories, will have been driven into oblivion.
He was afraid he might have dealt with his love affairs in some indecorous fashion, that might tend to the discredit and prejudice of the purity of his lady Dulcinea del Toboso; he would have had him set forth the fidelity and respect he had always observed towards her, spurning queens, empresses, and damsels of all sorts, and keeping in check the impetuosity of his natural impulses.
…force them to study this or that science I do not think wise, though it may be no harm to persuade them; and when there is no need to study for the sake of pane lucrando, and it is the student’s good fortune that heaven has given him parents who provide him with it, it would be my advice to them to let him pursue whatever science they may see him most inclined to; and though that of poetry is less useful than pleasurable, it is not one of those that bring discredit upon the possessor.
"Hold, sirs, hold!" cried Don Quixote in a loud voice; "we have no right to take vengeance for wrongs that love may do to us: remember love and war are the same thing, and as in war it is allowable and common to make use of wiles and stratagems to overcome the enemy, so in the contests and rivalries of love the tricks and devices employed to attain the desired end are justifiable, provided they be not to the discredit or dishonour of the loved object.
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.