IPA: /ɛkˈspɪeɪtə/
KK: /ɛkˈspɪeɪtər/
A person who makes amends or compensates for wrongdoing, often through a form of atonement.
The expiator sought forgiveness for his past mistakes by helping others in need.
Expiator → It is formed from "ex-" (meaning out of or from) and "piare" (meaning to atone or make amends). An expiator is someone who makes amends or atones for wrongdoing, effectively bringing something out of a state of guilt or sin.
Think of someone who is bringing their guilt 'out' ('ex-') and 'making amends' ('piare') for their actions — that's what an expiator does.