Atonement is when you say sorry or try to make up for something bad that you've done. It means that you try to make things right - you accept responsibility for what you did and try to do something to make it up. For example, if you hurt someone's feelings, you can apologize and try to do something nice for that person to show that you're sorry. Atonement is about more than just saying sorry - it involves showing that you mean it and that you're serious about making things better.