high horse

from WordNet (r) 3.0 (2006)

high horse
    n 1: an attitude of arrogant superiority; "get off your high
         horse and admit you are wrong"

from Moby Thesaurus II by Grady Ward, 1.0

30 Moby Thesaurus words for "high horse":
      Olympian detachment, Olympian loftiness, arrogance, arrogantness,
      assumption of superiority, condescendence, condescension,
      domineering, domineeringness, haughtiness, haughty airs, hauteur,
      hoity-toitiness, hoity-toity, loftiness, overbearing pride,
      overbearingness, overweening pride, patronization, patronizing,
      patronizing attitude, pride, proudness, purse-pride, side,
      stiff-necked pride, superbia, toploftiness, uppishness,
      uppityness