atonement
Making up for a wrong by fixing the hurt you caused.
Atonement means making up for something wrong you've done, usually something that hurt another person. It involves both genuine regret and taking real action to repair the damage and make things right again.
If you borrowed your brother's favorite book and accidentally ruined it, atonement might mean using your allowance to buy him a new copy. If you spread a rumor about a classmate, atonement would involve admitting you were wrong and working to restore their reputation. The word suggests genuine regret combined with meaningful effort to fix what you broke, whether that's a friendship, someone's trust, or their property.
In religious contexts, atonement often refers to restoring one's relationship with God through repentance and sacrifice.
Atonement takes courage because it requires admitting fault and then doing the hard work of making things better. A simple apology is only words, but atonement means proving through your actions that you understand what you did wrong and care enough to fix it.