Source : Webster's Revised Unabridged Dictionary (1913)

Lumber \Lum"ber\, b. t. [imp. & p. p. {Lumbered}; p. pr. & vb.
   n. {Lumbering}.]
   1. To heap together in disorder. `` Stuff lumbered
      together.'' --Rymer.

   2. To fill or encumber with lumber; as, to lumber up a room.