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Related to hash over: hash up
To discuss something in detail. A noun or pronoun can be used between "hash" and "over." I'm calling Mom right now to hash over the details for Thanksgiving dinner.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
hash (something) over (with someone)
Fig. to discuss something with someone. I need to hash this matter over with you. I've hashed over this business enough.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Also, hash out. Discuss carefully, review, as in Let's hash over these plans again, or The department was hashing out the new syllabus. This idiom uses the verb hash in the sense of "cut into small pieces," a usage dating from the mid-1700s.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.