Where does “siblar” come from?

siblar (Occitan) comes from Old Occitan ciblar, from Latin sībilāre, from Latin sībilus, from Proto-Indo-European sweysd- — to hiss.

siblar (Occitan): to whistle

Definitions

Step	Language	Word	Meaning
1	Old Occitan	ciblar	—
2	Latin	sībilāre	—
3	Latin	sībilus	—
4	Proto-Indo-European	sweysd-	to hiss

siblar — Etymology, Origin & Word History | Etymology Explorer