Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: upstart 'to jump up suddenly' (14-19 centuries)

upstart

 noun
     
up‧start [countable]
someone who behaves as if they were more important than they really are and who shows a lack of respect towards people who are more experienced or older:
a cheeky young upstart
—upstart adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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