From Longman Dictionary of Contemporary Englishget back at somebody phrasal verbREVENGEto do something to hurt or harm someone who has hurt or harmed you He’ll probably go out with her just to get back at me. → get→ See Verb table
Examples from the Corpus
get back at • So she spends a good part of the movie getting back at everyone for ostracizing her.• She may say things about me from time to time that aren't necessarily true just to get back at me, you know?• Perhaps they feel it is a way of getting back at the system that keeps them in the poverty gap.• The girl later admitted she made the story up to get back at the teacher for punishing her boyfriend.• The four witches dabble in the supernatural to get back at their enemies and fix a few personal-appearance problems.• He'd get back at them.• How I try to get back at them.• Maybe he's getting back at you. 