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What is the origin of the expression hashing out plans? I can't find a definition when googling for:

definition "to hash out plans"
definition "hash out plans"
definition "hashing out plans"
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try define:"hash out". –  Karl Knechtel Sep 2 '11 at 22:42
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6 Answers

The original meaning of the word hash was "to hack, chop into small pieces" from the French hacher, from Old French hache meaning axe. It often had culinary use, a hash being a chopped up mixture of things, most notably the dish hash browns, made of shredded potatoes. The expression to make hash out of sth/sbd, means to ruin sth/sbd and this follows logically from chop into small pieces

There is a derivation rehash, that dates from 1822, meaning talk over, discuss again or present in another form.

Later, hash over appears and although I cannot find a precise date, it seems to appear before hash out. The meaning is somewhat similar to rehash. A similar expression thrash out, had already been used for some time to mean working through the details of something and derived from the threshing of cereal crops to separate out the grain.

From around the 1940s I found some uses in google books of the form to hash out problems/differences, meaning to settle an argument through extensive debate. It seems a natural progression given the other expressions presented here. In modern usage hashing out plans/ideas still implies vigorous discussion but isn't necessarily an argument.

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You fail to show, however, how "to make hash out of something" -- which indicates failure -- shifted to "hash something out" -- which indicates, rather, a successful conclusion. I'd suggest the positive connotation comes from the culinary usage, and is a metaphor for "pulling out all the stops", and using whatever tools/opportunities/alternatives are available to cobble together some sort of agreement. –  Kyle Pearson Sep 3 '11 at 13:22
    
@Kyle I'm now inclined to think FumbleFingers has the correct answer here and have +1ed that one. –  z7sg Ѫ Sep 6 '11 at 16:24
    
FumbleFingers makes a great leap of logic; yes, the charts show that one expression went ascendant as another declined, but the explanation for this is far different from what he posits: "thrashing", as a transitive verb that means "to beat something", went on the decline in the US back at least 80 years ago, perhaps much longer. Today, "thrash" in the US is almost only ever used to describe a "violent motion, back and forth". In that context, the meaning of the phrase "thrash it out" is badly distorted, or contrary to the intended British usage. –  Kyle Pearson Sep 7 '11 at 5:00
    
"Hash", however, is a more-or-less common word that means "to make mince of something with a knife"; the verb (and related noun) was far more common in the mid-20th Century, when "hash-house" was a slang term for "local diner"; the reason for the usage was simply that "hash" was one of the most common dishes of the era. Thus, as "thrash it out" shifted in meaning, making the idiom "to beat something 'til a problem is solved" meaningless, "hash it out" arose to take its place, meaning "to break something down 'til a problem is solved." Your explanation is closer to that than his. –  Kyle Pearson Sep 7 '11 at 5:03
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Finally, saying that something is "an Americanism for 'thrash it out'" is but the most contemptuous, ethnocentric explanation of where "hash it out" originated. In fact, the word "hash" was adopted from French, of which there were still many millions within the US, spanning all the way from the origin of the Mississippi in Wisconsin on down to New Orleans, back in the early-mid 20th Century. FF's explanation is, in that regard, outright insulting: by the time this "Americanism" was "adapted" from British English (as he asserts), the US had already used "thrash it out" for 150 years. –  Kyle Pearson Sep 7 '11 at 5:08
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So far as I can tell, hash [something] out is just a relatively recent Americanism for thrash [it] out. Here's the American usage... enter image description here

...and here's the British version, showing that we simply don't use "hash" in this way. enter image description here

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+1 for not starting from 1800 –  Theta30 Sep 2 '11 at 17:33
    
@Bogdan Lătăianu: There is this one from 1921, but I can't find any earlier, and it doesn't really seem to have had any currency until several decades later. –  FumbleFingers Sep 2 '11 at 17:40
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The New Oxford American Dictionary says:

hash something out — come to agreement on something after lengthy and vigorous discussion: they went to the diner to hash out ideas.

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Here is the definition from Longman Dictionary:

to discuss something very thoroughly and carefully, especially until you reach an agreement

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I offer a complementary view on the evolution of the phrase: rehashhash overhash out. Although the similar "thrash it out" may have influenced the phrase, it seems possible that the two phrases developed mostly independently, in parallel.

I couldn't place the origin of "thrash it out" as an idiom, but it may be as old as the metaphorical sense of separating wheat from chaff. The literal difference between thrash and hash is clear, though. So, how (or when) did the meanings dovetail?

The Monthly Review, a 1789 literary journal published in London, offers this example:

[H]e preserved too much professional dignity to exhaust himself through the press; he did not hash out and dress up the same things in different modes and forms [. . .].

Admittedly, this is a single data point—it may not constitute idiomatic precedent—but here we see the description of a rehash (which "he" refrained from).

In 1840, Harriet Beecher Stowe's essay "Love Against Law" (or "Deacon Enos") was published:

[T]wo days after the funeral, (for I didn't like to go any sooner,) I stepped up to hash over the matter [of a land dispute] with old Silence [. . .] and so I thought I'd speak to old Silence, and see if she meant to do anything about it, thought I knew pretty well she wouldn't; and I tell you, if she did'nt put it on me! we had a regular pitched battle [. . .].

This instance carries essentially the same meaning as "hash out" does today.

I don't think the transition to out is necessarily due to "thrash it out" (implying Americans simply dropped the t and r?). We have similar constructions like "walk it off", "talk it over", "work it out" and so on. Rather than a deviation, it may be that "hash out" was one idiom that developed in its own right and became popular whereas "thrash it out" never caught on—or at least died out after it did (vice-versa in British English).

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Hash is also a programming term referring to processing some data and creating a unique value for it. In that vocabulary, to rehash is to reprocess or re-break down information. Perhaps due to its computer science use it has become more popular.

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