ex ‧ pi ‧ ate /ˈekspieɪt/ BrE AmE verb [transitive]
[ Date: 1500-1600 ; Language: Latin ; Origin: past participle of expiare , from pius ; ⇨ ↑ pious ]
formal to show you are sorry for something you have done wrong by accepting your punishment willingly, or trying to do something to improve what you did:
She expiated her crime by becoming a nun.
—expiation /ˌekspiˈeɪʃ ə n/ noun [uncountable]