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What is the meaning of the following sentence?

You have successfully split a hair that did not need to be split.

Source: this post on the Programmers Stack Exchange.

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If splitting hairs was banned, english.SE would cease to exist. I say this with much affection. – Ed Guiness Jul 12 '11 at 20:05
@EdGuiness, wouldn't it be more correct to remove that first comma ? (This is a joke :) ) – Joe Blow Jul 12 '11 at 20:47
up vote 3 down vote accepted

To "split hairs" is to be overly pedantic and precise (see http://www.merriam-webster.com/dictionary/split-hair). Someone saying that you split a hair that didn't need to be split is going one step further, saying that not only were you overly precise but it was well beyond what was needed.

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so its a negative sense / or neutral? – Pacerier Jul 12 '11 at 21:49
@Pacerier: In principle your sentence is extremely negative, as this answer indicates. But the amusing phrasing means it's almost certainly a combination of lightheartedly poking fun, and being witty. – FumbleFingers Jul 13 '11 at 1:14

To split hairs means

to pay too much attention in an argument to differences that are very small and not important

This often occurs as "let's not split hairs," meaning "let's not argue over trivial differences."

According to Wiktionary, the plural split hairs is also used as a noun, to mean

Tedious details; minutiae.

In your example, the writer takes it one step further by using split hair as a singular noun meaning a detail or difference. This use is probably not as common, but it's understandable.

So, "You have successfully split a hair that did not need to be split" means "you have managed to point out a small difference where it was unnecessary to do so; you have made a distinction where none needed to be made."

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See discussion on: english.stackexchange.com/questions/33885/… – mgb Jul 12 '11 at 20:17

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