upstart - definition, thesaurus and related words from WordNet-Online

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Adjective upstart has 1 sense

nouveau-riche, parvenu, parvenue, upstart - characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position
Antonym: unpretentious (indirect, via pretentious)

Noun upstart has 3 senses

upstart - an arrogant or presumptuous person
--₁ is a kind of unpleasant person, disagreeable person
--₁ has particulars:
wise guy, smart aleck, wiseacre, wisenheimer, weisenheimer
upstart, parvenu, nouveau-riche, arriviste - a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class
--₂ is a kind of unpleasant person, disagreeable person
--₂ has particulars: social climber, climber; junior
kip, upstart - a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an errect position by arching the back and swinging the legs out and down while forcing the chest upright
--₃ is a kind of gymnastic exercise