Source : Webster's Revised Unabridged Dictionary (1913)

Rushbuckler \Rush"buc`kler\, n.
   A bullying and violent person; a braggart; a swashbuckler.
   [Obs.]

         That flock of stout, bragging rushbucklers. --Robynson
                                                  (More's
                                                  Utopia).