Francophonie· easy
avoir un cheveu sur la langue
“to have a hair on the tongue”
Meaning
to speak with a lisp
Explanation
It's used for someone who lisps, slurring or whistling certain sounds, as if something were physically stuck on their tongue.
Example
Il a un cheveu sur la langue, alors il prononce les 's' un peu bizarrement.
He's got a lisp, so he pronounces his S's a bit oddly.
Origin
The logic is simple: a hair stuck on your tongue would genuinely throw off your speech, and that physical image became shorthand for anyone who lisps.
Source
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