hash out

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hash out (third-person singular simple present hashes out, present participle hashing out, simple past and past participle hashed out)

1. (idiomatic) To work through the details of something; especially to work through difficulties.

   They stayed up late hashing out the details of the contract.

   • 2005, John McCain, Winning the War in Iraq

     The Iraqi people have shown their impulse toward democracy; they need security in order to hash out the many remaining differences that still divide them.

• hammer out