He professes to have received no sinister measure from his judge, but most willingly humbles himself to the determination of justice: yet had he framed to himself, by the instruction of his frailty, many deceiving promises of life; which I, by my good leisure, have discredited to him, and now he is resolved to die.
There are no more uses of "discredit" in the play.
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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.