get back at
Take revenge on, as in Watch out for Peter; he's sure to get back at you. Similarly, get one's own back means simply "get revenge," as in She finally saw a chance to get her own back. The first expression dates from the late 1800s, the second from the early 1900s.
|a scrap or morsel of food left at a meal.|
|the offspring of a zebra and a donkey.|
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