1. a person who has risen suddenly from a humble position to wealth, power, or a position of consequence.
2. a presumptuous and objectionable person who has so risen; parvenu.
being, resembling, or characteristic of an upstart.
1. to spring into existence or into view.
2. to start up; spring up, as to one's feet.
to cause to start up.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.