Akademik

get one's own back
(informal)
HAVE/GET/TAKE ONE'S REVENGE (ON), be revenged (on), hit back, get (back at), get even (with), settle accounts (with), repay, pay someone back, give someone their just deserts, retaliate (against/on), take reprisals (against), exact retribution (on), give someone a taste of their own medicine.
own

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phrasal
: to revenge oneself : get even

they're out to get their own back — T.C.Worsley

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get one's own back (informal)
To have one's revenge (on)
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Main Entry:get
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get one's own back
To retaliate, get even
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Main Entry:own

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informal take action in retaliation for a wrongdoing or insult

Useful english dictionary. 2012.