IPA: //ˈɛk.spi.eɪt//
KK: /ɛkˈspieɪt/
To make up for a wrongdoing or to atone for a mistake.
He tried to expiate his past mistakes by helping others.
Past: expiated
Past Participle: expiated
Expiate → It is formed from "ex-" (meaning out of or from) and "piare" (meaning to atone or make amends). The word "expiate" means to make amends or atone for wrongdoing, essentially to cleanse oneself from guilt.
Think of 'making amends' ('piare') by coming 'out of' ('ex-') a state of guilt — that's what expiate means.