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English definition of “upstart”

upstart

noun [C] uk   /ˈʌp.stɑːt/ us    /-stɑːrt/

upstart noun [C] (PERSON)

disapproving a person, especially a young one, who has suddenly got power or an important position and takes advantage of this in an unpleasant way

upstart noun [C] (BUSINESS)

a new competitor: Larger drug companies are buying up many of the upstart firms.
(Definition of upstart from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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