Definition of upset verb from the Oxford Advanced Learner's Dictionary

      

    upset

     verb
    verb
    BrE BrE//ʌpˈset//
     
    ; NAmE NAmE//ʌpˈset//
     
    Verb Forms present simple I / you / we / they upset
    BrE BrE//ʌpˈset//
     
    ; NAmE NAmE//ʌpˈset//
     
    he / she / it upsets
    BrE BrE//ʌpˈsets//
     
    ; NAmE NAmE//ʌpˈsets//
     
    past simple upset
    BrE BrE//ʌpˈset//
     
    ; NAmE NAmE//ʌpˈset//
     
    past participle upset
    BrE BrE//ʌpˈset//
     
    ; NAmE NAmE//ʌpˈset//
     
    -ing form upsetting
    BrE BrE//ʌpˈsetɪŋ//
     
    ; NAmE NAmE//ʌpˈsetɪŋ//
     
    Being ill
     
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  1. 1  to make somebody/yourself feel unhappy, anxious or annoyed synonym distress upset somebody/yourself This decision is likely to upset a lot of people. Try not to let him upset you. Don't upset yourself about it—let's just forget it ever happened. it upsets somebody that… It upset him that nobody had bothered to tell him about it. it upsets somebody to do something It upsets me to think of her all alone in that big house.
  2. 2upset something to make a plan, situation, etc. go wrong He arrived an hour late and upset all our arrangements.
  3. 3upset somebody’s stomach to make somebody feel sick after they have eaten or drunk something See related entries: Being ill
  4. 4upset something to make something fall over by hitting it by accident She stood up suddenly, upsetting a glass of wine.
  5. Extra examples I’m sorry—I didn’t mean to upset you. Keep the volume down—we don’t want to upset the neighbours! She was sensitive and easily upset. Don’t upset yourself about it. The disagreement further upset relations between the two countries. Their plans were upset even more by days of torrential rain.Idioms to cause problems for somebody or spoil their plans, arrangements, etc.
See the Oxford Advanced American Dictionary entry: upset