All 3 Uses

discredit
in
A Passage to India
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He made pleasant remarks and a few jokes, which were applauded lustily, but he knew something to the discredit of nearly every one of his guests, and was consequently perfunctory.†
Chpt 5 *

discredit = damage the reputation of
Miss Quested was so loathed in Chandrapore that her recantation was discredited, and the rumour ran that she had been stricken by the Deity in the middle of her lies.†
Chpt 25

discredited = damaged the reputation of
It's not an attack from our people I fear—you should see their orderly conduct at the hospital; what we must guard against is an attack secretly arranged by the police for the purpose of discrediting you.†
Chpt 26

discrediting = damaging the reputation of

Definitions:

(1) (discredit)
damage the reputation of -- often causing distrust of or disbelief in
(2) (meaning too rare to warrant focus)