splitting hair

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Definition of splitting hair in English English dictionary

hair-splitting
the act of finding exceedingly small differences which are probably neither important nor noticeable to most people

Dick's Tribune poked endless fun at the hair-splitting sectarianism of the various Trotskyist groups jostling on the fringes of the Labour party at that time.

hair splitting
make very fine distinctions
hair-splitting
when people pay too much attention to small differences and unimportant details, especially in an argument split hairs split (8)