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English definition of “upset”

upset

verb [T] (CHANGE)    /ʌpˈset/ (present participle upsetting, past tense and past participle upset)
to change the usual or expected state or order of something, especially in a way that stops it from happening or working: Any mechanical problems would upset our plans of driving across the desert.Upsetting and destabilizing
(Definition of upset verb (CHANGE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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