simple past tense and past participle of upstart

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.

to rise suddenly, to spring

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

present participle of upstart

The behaviour or attitudes of an upstart.

The quality of being an upstart.

(transitive, archaic) To cause to rise up in startlement.

(archaic, poetic) Startled awake or into action.