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English definition of “upset”

upset

noun (CHANGE)    /ˈʌp.set/
[U] confusion and problems: How much upset will the new monitoring procedures cause?Upsetting and destabilizing [C] an occasion when someone beats the team or player that was expected to win: It would be quite an upset if the favourite didn't win.Winning and defeatingScoring, winning and losing in sport
(Definition of upset noun (CHANGE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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