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English definition of “upset”

upset

verb [T] (WORRY)    /ʌpˈset/ (present participle upsetting, past tense and past participle upset)
B2 to make someone worried, unhappy, or angry: It still upsets him when he thinks about the accident. Don't upset yourself by thinking about what might have been.Making people sad, shocked and upset
(Definition of upset verb (WORRY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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