Repudiate
/rɪˈpjuːdiˌeɪt/ verb hardTo formally reject or refuse to accept something as true, valid, or binding.
The senator quickly repudiated the rumor that he had accepted money from the company.
Memory Trick
Repudiate is built on the same Latin root as 'pudere,' to feel shame -- imagine publicly casting off a claim and refusing any shameful connection to it.