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English definition of “jumped-up”

jumped-up

adjective [before noun] uk   /ˌdʒʌmptˈʌp/ UK informal disapproving us  
behaving as if you are very important in your job or position, especially because you used to be in a much lower position: He's just a jumped-up office boy (= he was once only an office boy) .Showing arrogance and conceitConfidence and self-assuranceBoasting
(Definition of jumped-up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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