thresh
verb
[ θrɛʃ ]
• separate grain from (corn or other crops), typically with a flail or by the action of a revolving mechanism.
• "machinery that can reap and thresh corn in the same process"
• move violently; thrash.
• "a creature threshing in a net"
Origin:
Old English therscan, later threscan, of Germanic origin; related to Dutch dorsen and German dreschen . Compare with thrash.