strike back

Short definition from Wiktionary

Verb

1. 1
   To respond to an attack by attacking one's opponent or opponents.
2. 2
   To leave or set out (in a particular direction, often to where one has been).
3. 3
   To send (light, heat, a substance) in the direction of its source.
4. 4
   To push or force (someone or something) away.