get your own back
US /ɡɛt jʊər oʊn bæk/
UK /ɡɛt jʊər oʊn bæk/
1.
to take revenge on someone for something they have done to you
:
•
After he tricked me, I decided to get my own back by playing a prank on him.
•
She was determined to get her own back on her rival.