Expiate (verb)

1. To make amends or reparation for (guilt or sin).
2. To make amends or reparation for guilt, sin or wrongdoing, typically through an act of penance or sacrifice.

Origin:

From the latin word "expiare" meaning "to atone for" or "to make amends for".

Examples:

1. He felt he needed to expiate his sins.
2. He performed acts of charity to expiate his guilt.
3. She felt the need to expiate her actions.
4. She fasted to expiate her sins.
5. He went on a pilgrimage to expiate his sins.