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English definition of “pay sb back”

pay sb back

phrasal verb with pay     /peɪ/ verb (paid, paid)
to do something unpleasant to someone because they have done something unpleasant to you: He swore he'd pay her back for all she'd done to him.Revenge and vengefulness
(Definition of pay sb back from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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