All 4 Uses

discredit
in
The Spy Who Came In From The Cold
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"We really must discredit Mundt," he said.†
Chpt 2 *

discredit = damage the reputation of
In the earlier days the city had been thronging with second-rate agents: intelligence was discredited and so much a part of the daily life of Berlin that you could recruit a man at a cocktail party, brief him over dinner and he would be blown by breakfast.†
Chpt 8

discredited = damaged the reputation of
When the first reports came in from Peters in The Hague, Mundt had only to look at the dates of Leamas' visits to Copenhagen and Helsinki to realize that the whole thing was a plant—a plant to discredit Mundt himself.†
Chpt 21

discredit = damage the reputation of
Your job was to discredit me.†
Chpt 25

Definitions:

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