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upset

adjective (ILL)
 
 
/ʌpˈset/ informal

Definition

B2 If you have an upset stomach you feel slightly ill, especially because of something you have eaten or drunk: I've got an upset stomach/tummy - serves me right for eating so much.Digestive disorders
(Definition of upset adjective (ILL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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