verb (used with object)
to beat soundly in punishment; flog.
to defeat thoroughly: The home team thrashed the visitors.
Nautical. to force (a close-hauled sailing ship under heavy canvas) against a strong wind or sea.
verb (used without object)
to toss, or plunge about.
Nautical. to make way against the wind, tide, etc.; beat.
an act or instance of thrashing; beating; blow.
Swimming. the upward and downward movement of the legs, as in the crawl.
British Slang. a party, usually with drinks.
Verb phrases
thrash out/over, to talk over thoroughly and vigorously in order to reach a decision, conclusion, or understanding; discuss exhaustively. Also, thresh out/over.

before 900; Middle English thrasshen, variant of thresshen to thresh

unthrashed, adjective
well-thrashed, adjective

thrash, thresh.

1. maul, drub. See beat. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thrash (θræʃ)
1.  (tr) to beat soundly, as with a whip or stick
2.  (tr) to defeat totally; overwhelm
3.  (intr) to beat or plunge about in a wild manner
4.  (intr) to move the legs up and down in the water, as in certain swimming strokes
5.  to sail (a boat) against the wind or tide or (of a boat) to sail in this way
6.  another word for thresh
7.  the act of thrashing; blow; beating
8.  informal a party or similar social gathering
[Old English threscan; related to Old High German dreskan, Old Norse thriskja]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1588, "to separate grains from wheat, etc., by beating," dial. variant of threshen (see thresh). Sense of "beat (someone) with (or as if with) a flail" is first recorded 1606. Meaning "to make wild movements like those of a flail or whip" is attested from 1846. Type of fast
heavy metal music first called by this name 1982.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

thrash definition

To move wildly or violently, without accomplishing anything useful. Paging or swapping systems that are overloaded waste most of their time moving data into and out of core (rather than performing useful computation) and are therefore said to thrash. Thrashing can also occur in a cache due to cache conflict or in a multiprocessor (see ping-pong).
Someone who keeps changing his mind (especially about what to work on next) is said to be thrashing. A person frantically trying to execute too many tasks at once (and not spending enough time on any single task) may also be described as thrashing.
Compare multitask.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Once in a while they would bump into each other and thrash around.
Native people, loggers, and environmentalists sat down to help thrash out a
  plan for the other half.
They are workers with quotas and bosses who equip them to thrash online trolls,
  gnomes and ogres.
He carefully lifted the fish out of the creek, let it thrash about, then
  lowered the line and returned the fish to the water.
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