thrashing floor

from The Collaborative International Dictionary of English v.0.48

Thrashing \Thrash"ing\,
   a. & n. from {Thrash}, v.
   [1913 Webster]

   {Thrashing floor}, {Threshing-floor}, or {Threshing floor}, a
      floor or area on which grain is beaten out.

   {Thrashing machine}, a machine for separating grain from the
      straw.
      [1913 Webster]