What does the word upstart mean?

Usage examples for upstart

  1. This extravagance of upstart theory and fitful experiment without end, all tended to check colonial enterprise and destroy the public tranquillity. – The History of Tasmania, Volume I (of 2) by John West
  2. To have this upstart defend Mrs. Bagley, in whose presence he could hardly lash back, put Mr. Fisher in a very unhappy state of mind. – The Fourth R by George Oliver Smith
  3. She makes Aunt Miriam look like a vulgar, blatant little upstart! – The Whirligig of Time by Wayland Wells Williams