The Collaborative International Dictionary of English v.0.48:

Down \Down\, v. t. [imp. & p. p. Downed; p. pr. & vb. n.
   Downing.]
   To cause to go down; to make descend; to put down; to
   overthrow, as in wrestling; hence, to subdue; to bring down.
   [Archaic or Colloq.] "To down proud hearts." --Sir P. Sidney.
   [1913 Webster]

         I remember how you downed Beauclerk and Hamilton, the
         wits, once at our house.                 --Madame
                                                  D'Arblay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Downing
    n 1: United States landscape architect who designed the grounds
         of the White House and the Capitol Building (1815-1852)
         [syn: Downing, Andrew Jackson Downing]