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English definition of “nemesis”

nemesis

noun [C] uk   /ˈnem.ə.sɪs/ (plural nemeses) literary us  
Someone's nemesis is a person or thing that is very difficult for them to defeat.Enemies and rivals (a cause of) punishment or defeat that is deserved and cannot be avoided: The tax increases proved to be the president's political nemesis at the following election.FailuresAccidents and disastersHigher and lower points of achievementDifficult things and peoplePreventing and impeding
(Definition of nemesis from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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