avenge

Short definition from Wiktionary

Verb

1. 1
   To take vengeance (for); to exact satisfaction for by punishing the injuring party; to vindicate by inflicting pain or evil on a wrongdoer.
2. 2
   To revenge oneself (on or upon someone).
3. 3
   To take vengeance.
4. 4
   To treat revengefully; to wreak vengeance on.

Noun

1. 1
   An act of vengeance; a revenge.