thrash out

Collins Concise English Dictionary © HarperCollins Publishers::

thrash out verb

1. (tr, adverb) to discuss fully or vehemently, esp in order to come to a solution or agreement

WordReference Random House Learner's Dictionary of American English © 2025

thrash /θræʃ/   v. 

1. [~ + object] to beat soundly in punishment;
   flog.
2. to defeat thoroughly:
   [~ + object] Our team was thrashed by a score of 10-0.
3. to plunge about wildly or violently:
   [no object] She was thrashing around in bed, having a terribly bad nightmare.
4. thrash out or over, [~ + out/over + object] to talk over thoroughly to reach a decision or understanding:
   They decided to sit down and thrash out an agreement.

WordReference Random House Unabridged Dictionary of American English © 2025

thrash (thrash),  v.t. 

1. to beat soundly in punishment;
   flog.
2. to defeat thoroughly:
   The home team thrashed the visitors.
3. Nautical, Naval Terms to force (a close-hauled sailing ship under heavy canvas) against a strong wind or sea.
4. thresh.

v.i. 

5. to toss, or plunge about.
6. Nautical, Naval Terms to make way against the wind, tide, etc.;
   beat.
7. thresh.
8. thrash out or over, to talk over thoroughly and vigorously in order to reach a decision, conclusion, or understanding;
   discuss exhaustively.

n. 

9. an act or instance of thrashing;
   beating;
   blow.
10. thresh.
11. [Swimming.] the upward and downward movement of the legs, as in the crawl.
12. British Terms a party, usually with drinks.

• Middle English thrasshen, variant of thresshen to thresh bef. 900

Synonyms

• 1. maul, drub. See beat.