Entry 4 senses · 3 variants Webster, 1913 Upstart /ŭp'-stärtˌ/ · Up·start · IPA /ˈʌp.stɑːt/ v. i. n. a. 01 v. i. To start or spring up suddenly. 1. To start or spring up suddenly. 02 n. One who has risen suddenly, as from low life to wealth, power, or honor; a parvenu. 1. One who has risen suddenly, as from low life to wealth, power, or honor; a parvenu. 2. The meadow saffron.(Bot.) 03 a. Suddenly raised to prominence or consequence. 1. Suddenly raised to prominence or consequence.