Synonyms of 'expiation'
a rite of expiation for their sins
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If you do something as an atonement for doing something wrong, you do it to show that you are sorry.
True guilt is marked by a willingness to make atonement.
If you do penance for something wrong that you have done, you do something that you find unpleasant to show that you are sorry.
carrying out acts of penance for his sins
The penance imposed on him proved light.
Thesaurus for expiation from the Collins English Thesaurus
the act, process, or a means of expiating ; atonement