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English definition of “upset”

upset

verb [T] (CHANGE)   /ˌʌpˈset/ (present participle upsetting, past tense and past participle upset)
to change the usual or expected state or order of something in a way that stops it from happening or working: The airline strike could upset our vacation plans.
(Definition of upset verb (CHANGE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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