Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: thresh

thrash

1 verb
     
thrash1
1 [intransitive always + adverb/preposition, transitive] to move or make something move from side to side in a violent or uncontrolled way
thrash about/around
The girl was thrashing about in the water.
Salmon thrash their tails and leap from the water.
2 [transitive] to beat someone violently, especially in order to punish them:
My poor brother used to get thrashed for all kinds of minor offences.
3 [transitive] informal to defeat someone very easily in a game:
Brazil thrashed Italy 5-0.

thrash something ↔ out

phrasal verb
to discuss something thoroughly with someone until you find an answer, reach an agreement, or decide on something:
We still have to get together and thrash out the details.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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