Third-person singular simple present indicative form of upstart

One who has suddenly gained wealth, power, or other prominence, but either has not received social acceptance or has become arrogant or presumptuous. / The meadow saffron.

Acting like a parvenu. / self-important and presumptuous.

to rise suddenly, to spring

present participle of upstart

simple past tense and past participle of upstart

The behaviour or attitudes of an upstart.

The quality of being an upstart.