An avenging person is seeking revenge for something bad that happened.
When someone's family member or friend was hurt or wronged in some way, they might feel angry and want to make things right. This can lead them to become an avenger - someone who tries to get even with the people responsible for what went down. For instance, if a person's sibling was bullied at school, the sibling's older brother might become an avenger and try to stand up to the bullies themselves or find a way to make the adults in charge deal with the problem.
To take vengeance (for); to exact satisfaction for by punishing the injuring party; to vindicate by inflicting pain or evil on a wrongdoer.
Example: to avenge the murder of his brother
The act by which somebody is avenged.
