verb
(transitive) To harm the good reputation of (a person).
(transitive) To cause (an idea or piece of evidence) to seem false or unreliable.
noun
(countable or uncountable) Discrediting or disbelieving.
(countable) A person or thing that causes harm to a reputation, as of a person, family, or institution.
(uncountable) The state of being discredited or disbelieved.
(uncountable) A degree of dishonour or disesteem; ill repute; reproach.