Definition of upstart noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈʌpstɑːt//
; NAmE NAmE//ˈʌpstɑːrt//
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a person who has just started in a new position or job but who behaves as if they are more important than other people, in a way that is annoying
See the Oxford Advanced American Dictionary entry: upstart