IPA: /əˈtoʊnər/
KK: /əˈtoʊnər/
A person who makes amends or reparations for a wrongdoing or sin.
He became an atoner after realizing the impact of his actions on others.
Atoner → It is formed from "atone" (from the phrase "at one," meaning in harmony or in agreement) and "-er" (meaning a person who). An atoner is a person who seeks to make amends or restore harmony.
Think of someone trying to bring things 'together' ('at one') to make amends — that's what an atoner does.