Pronunciation: [splˈɪt hˈe͡əz] (IPA) 
The phrase "split hairs" means to argue over small or insignificant details. It is spelled with an "s" in both words, despite the fact that the "s" in "hairs" is pronounced as a "z" sound. This is because in English, the letter "s" can be pronounced as a "z" sound when it appears between vowels or at the end of a syllable. The IPA phonetic transcription for "split hairs" is /splɪt hɛrz/.
To split hairs means to argue or discuss minor or insignificant details of a particular matter or issue. This phrase is often used when someone is being overly meticulous or nitpicking in their analysis or criticism.
When individuals split hairs, they focus on very small or subtle distinctions, often losing sight of the bigger picture or main point. This behavior can be seen as an unnecessary and tedious exercise, as it tends to prolong or complicate discussions instead of reaching a resolution.
Splitting hairs is characteristic of individuals who have a tendency to be overly critical or perfectionistic. They may scrutinize minute differences or flaws in order to highlight them, often disregarding the broader context or main objective.
The phrase "split hairs" originated from the act of actually dividing individual strands of hair, an endeavor that requires painstaking attention and precision. Just as carefully dissecting each strand of hair is time-consuming and unnecessary, splitting hairs metaphorically refers to the act of needlessly delving into trivial details.
Using this phrase in conversation conveys a sense of exasperation or impatience with someone who is focusing on inconsequential aspects rather than the overall significance or outcome. It can also be used to caution against excessive scrutiny of minor discrepancies that may detract from the main point or objective.
The phrase "split hairs" can be traced back to the 16th century and has its roots in the literal act of splitting or dividing individual hairs. At that time, it was used to describe an incredibly meticulous or detailed approach to a task. The earliest known written use of the phrase is seen in the works of English playwright William Camden, in his 1586 work "Remaines of a Greater Worke Concerning Britaine". From there, the phrase gradually developed its current figurative meaning of excessively nitpicking or making unnecessary distinctions in an argument or discussion.
