upstart Definition in the Cambridge English Dictionary
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Definition of “upstart” - English Dictionary

Definition of "upstart" - American English Dictionary

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upstartadjective [not gradable]

 us   /ˈʌpˌstɑrt/
new and not ​experienced: Upstart ​airlines like Southwest are ​competing today with the ​establishedcarriers like Delta.
(Definition of upstart from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "upstart" - British English Dictionary

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upstartnoun [C]

uk   /ˈʌp.stɑːt/  us   /-stɑːrt/

upstart noun [C] (PERSON)

disapproving a ​person, ​especially a ​young one, who has ​suddenly got ​power or an ​importantposition and ​takesadvantage of this in an ​unpleasant way

upstart noun [C] (BUSINESS)

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

Definition of "upstart" - Business English Dictionary

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upstartnoun [C]

uk   us   /ˈʌpstɑːt/
WORKPLACE a ​company that has only recently been ​started: The ​articleshows how ​maturecompanies can ​challenge upstarts. Larger ​drugcompanies are ​buying up many of the upstart ​firms.
(Definition of upstart from the Cambridge Business English Dictionary © Cambridge University Press)
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