Webster's Revised Unabridged Dictionary · 1913

Upstart

Upstart , intransitive verb

To start or spring up suddenly. — Spenser. Tennyson

Upstart , noun

1.
One who has risen suddenly, as from low life to wealth, power, or honor; a parvenu. — Bacon
2.
(Botany) The meadow saffron. — Dr. Prior

Upstart , adjective

Suddenly raised to prominence or consequence.
A race of upstart creatures. — Milton