Definition of get one's own back in US English:

get one's own back

phrase

informal
  • Take action in retaliation for a wrongdoing or insult.

    • ‘But if her husband David gives her a hard time at work, then the mother-of-two gets her own back when they get home.’
    • ‘My one regret is that he retired from the game before I had a chance to get my own back.’
    get one's revenge, have one's revenge, take one's revenge, get one's revenge on, have one's revenge on, take one's revenge on, be revenged, be revenged on, revenge oneself, revenge oneself on, hit back, get back at, get, get even, get even with, even the score, even the score with, settle a score, settle the score, settle accounts, settle accounts with, give as good as one gets, play tit for tat, repay, pay someone back, give someone their just deserts, reciprocate, retaliate, retaliate against, retaliate on, take reprisals, take reprisals against, exact retribution, exact retribution on, let someone see how it feels, give someone a taste of their own medicine
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