discredit
verbUK /dɪsˈkredɪt/
US /dɪsˈkredɪt/
To make people stop believing or trusting someone or something.
The new evidence discredited the witness's story.
OTHER MEANINGS
2. To damage the good reputation of someone or something.
The scandal discredited the entire department.
3. To show that a claim or idea is false or unreliable.
Later experiments discredited the old theory.
4. Loss of good name or standing; disgrace.
He brought discredit on his family by cheating.