upstart
ups·tart
noun
1.
an arrogant or presumptuous person
2.
adjective
1.
characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position
Origin
From Middle English upstarten, upsterten, equivalent to up- + start.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.