Source : Webster's Revised Unabridged Dictionary (1913)

Down \Down\, a.
   1. Downcast; as, a down look. [R.]

   2. Downright; absolute; positive; as, a down denial. [Obs.]
      --Beau. & Fl.

   3. Downward; going down; sloping; as, a down stroke; a down
      grade; a down train on a railway.

   {Down draught}, a downward draft, as in a flue, chimney,
      shaft of a mine, etc.

   {Down in the mouth}, chopfallen; dejected.