IPA: /rɪˈpjuːdiˌeɪtə/
KK: /rɪˈpjuːdiˌeɪtər/
A person who rejects or disavows something, especially a belief, claim, or authority.
The repudiator of the agreement made it clear that they would not accept the terms.
Repudiator → It is formed from "repudiare" (meaning to reject or disown) and "-tor" (meaning one who). The word "repudiator" refers to one who rejects or disowns something.
Think of someone who 'rejects' ('repudiare') something — that's why a repudiator is someone who disowns or rejects.