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English definition of “upset”

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upset

verb [T]
 
 
/ʌpˈset/ ( present participle upsetting, past tense and past participle upset)
WORRY B2 to make someone feel unhappy or worried: The phone call had clearly upset her.Making people sad, shocked and upset
SPOIL to cause problems for something: If I arrived later, would that upset your plans?Upsetting and destabilizing
upset sb's stomach to make someone feel sick in the stomachBeing and falling ill
(Definition of upset verb from the Cambridge Learners Dictionary © Cambridge University Press)
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