Expiation refers to the act of making amends or seeking forgiveness for a wrongdoing or a sin. It involves acknowledging responsibility for one's actions and taking steps to make up for any harm caused. Expiation can involve making restitution, expressing remorse, or engaging in acts of contrition, such as prayer or self-punishment. The concept of expiation is often associated with religious or moral traditions that emphasize the importance of accountability and moral responsibility for one's actions.