Expression: Couper les cheveux en quatre
Pronunciation: [koo pay lay sheu veu a(n) kahtr]
Meaning: to split hairs, quibble, nit-pick
Literal translation: to cut the hair into quarters
Register: normal
Notes: Couper les cheveux en quatre is one of the few idiomatic French expressions with a similar meaning and literal translation in English. It's not quite identical in the two languages, since "split" implies the hair being sliced in two pieces, whereas the French clearly calls for four. But the end result is the same: we're all talking about very minor differences.
Example
Alors là, c'est couper les cheveux en quatre.
Now you're just splitting hairs.
Synonyms: chercher la petite bête (literally, "to search for the little bug"), chicaner, chinoiser, ergoter, pinailler
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