upstartyoudaoicibaDictYouDict
upstart: [16] An upstart is etymologically simply someone who has ‘started up’ – but start in its early sense ‘jump, spring, rise’. Start-up was an early alternative version of the word (‘That young start-up hath all the glory of my overthrow’, says Don John in Shakespeare’s Much Ado About Nothing 1599), but it did not survive the 17th century.
upstart (n.)youdaoicibaDictYouDict
1550s, "one newly risen from a humble position to one of power, importance, or rank, a parvenu," also start-up, from up (adv.) + start (v.) in the sense of "jump, spring, rise." As an adjective from 1560s. Compare the archaic verb upstart "to spring to one's feet," attested from c. 1300.