Wordnet 3.0
NOUN (1)
1. 
 the separation of grain or seeds from the husks and straw; 
- Example: "they used to do the threshing by hand but now there are machines to do it"
The Collaborative International Dictionary of English v.0.48:
Thresh \Thresh\, v. t. & i. [imp. & p. p. Threshed; p. pr. &
   vb. n. Threshing.]
   Same as Thrash.
   [1913 Webster]
         He would thresh, and thereto dike and delve. --Chaucer.
   [1913 Webster]
WordNet (r) 3.0 (2006):
threshing
    n 1: the separation of grain or seeds from the husks and straw;
         "they used to do the threshing by hand but now there are
         machines to do it"
Easton's 1897 Bible Dictionary:
Threshing
   See AGRICULTURE.