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To engage in a thorough discussion in order to determine a solution to a problem. A noun or pronoun can be used between "thrash" and "out." We had to stay an extra two hours thrashing this issue out. We're organizing a committee to thrash out the homelessness crisis in the city.
thrash something out
Fig. to discuss something thoroughly and solve any problems. The committee took hours to thrash the whole matter out. John and Anne thrashed out the reasons for their constant disagreements.
Discuss fully, especially to resolve a problem, as in We'll just have to thrash out our ideas about where to go on vacation. [Late 1800s]
1. To discuss or examine something fully: The committee thrashed out the new budget. The politician thrashed the issue out with her advisers.
2. To come to some agreement or solution through intense debate: The two sides finally thrashed out a compromise. The defense thrashed a deal out with the prosecution.