get your own back
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get (one's) own back
To take or get revenge upon a person or group of people, especially as a means of recompense or personal satisfaction for a slight or previous setback; to avenge oneself. Jonathan bullied me mercilessly at school, but I eventually got my own back when I bought out his father's business and became his boss. Our ground troops may have been outgunned by the insurgents, but we'll get our own back when we begin the airstrikes.
get your own backBRITISH, INFORMAL
COMMON If you get your own back on someone, you take revenge on them because of something that they have done to you. You're only interested in getting your own back on Terence. I was bullied at school and I want to get my own back.