bottom grass

from The Collaborative International Dictionary of English v.0.48

Bottom \Bot"tom\, a.
   Of or pertaining to the bottom; fundamental; lowest; under;
   as, bottom rock; the bottom board of a wagon box; bottom
   prices.
   [1913 Webster]

   {Bottom glade}, a low glade or open place; a valley; a dale.
      --Milton.
      [1913 Webster]

   {Bottom grass}, grass growing on bottom lands.

   {Bottom land}. See 1st {Bottom}, n., 7.
      [1913 Webster]