- To expiate is defined as to admit you did something that was a sin or something you feel guilty about.
When you feel guilty about a lie you told, and you come clean and ask for forgiveness, this is an example of a time when you expiate.
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verb ex·pi·at·ed, ex·pi·at·ing, ex·pi·ates verb, transitive
Origin: Latin expiāre, expiāt- : ex-, intensive pref.; see ex- + piāre, to atone (from pius, devout).
- exˈpi·aˌtor noun