Meaning of “upstart” in the English Dictionary

"upstart" in American English

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upstartadjective [ not gradable ]

us /ˈʌpˌstɑrt/

new and not experienced:

Upstart airlines like Southwest are competing today with the established carriers like Delta.

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

"upstart" in Business English

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upstartnoun [ C ]

uk /ˈʌpstɑːt/ us

WORKPLACE a company that has only recently been started:

The article shows how mature companies can challenge upstarts.
Larger drug companies are buying up many of the upstart firms.

(Definition of “upstart” from the Cambridge Business English Dictionary © Cambridge University Press)