Meaning of “upset” in the English Dictionary

"upset" in British English

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upsetverb [ T ]

uk /ʌpˈset/ us /ʌpˈset/ present participle upsetting, past tense and past participle upset

upset verb [ T ] (WORRY)

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.

More examples

upset verb [ T ] (MAKE SICK)

to make someone feel slightly sick:

He can't eat grapes - they upset him/his stomach.

upsetadjective

uk /ʌpˈset/ us /ʌpˈset/

upsetnoun

uk /ˈʌp.set/ us /ˈʌp.set/

upset noun (ILLNESS)

[ C ] informal a slight illness of the stomach:

Melanie has a stomach/tummy upset so she won't be going to school today.

(Definition of “upset” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"upset" in American English

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upsetverb [ T ]

us /ˌʌpˈset/ present participle upsetting, past tense and past participle upset

upset verb [ T ] (WORRY)

to make someone worried, unhappy, or angry:

The governor’s veto upset a lot of people.

upset verb [ T ] (CHANGE)

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.

upset verb [ T ] (FEEL ILL)

to make your stomach feel bad:

Too much fried food can upset your stomach.

upsetadjective

us /ˌʌpˈset/

upset adjective (WORRIED)

worried, unhappy, or angry:

Mom gets really upset if we don’t call and tell her where we are.
She was very upset about losing her wallet.

upset adjective (ILL)

(of the stomach) feeling bad:

Ginger (= the spicy root of a tropical plant) has been used to calm an upset stomach.

upsetnoun [ C ]

us /ˈʌpˌset/

(in sports) a surprising victory by a person or team that was expected to lose

(Definition of “upset” from the Cambridge Academic Content Dictionary © Cambridge University Press)