The act of discrediting or disbelieving, or the state of being discredited or disbelieved; as, later accounts have brought the story into discredit.(noun)
source: webster1913
verb (v)
cause to be distrusted or disbelieved(verb.cognition)
Example: The paper discredited the politician with its nasty commentary.
source: wordnet30
damage the reputation of(verb.communication)
Example: This newspaper story discredits the politicians.