Where does “susurrō” come from?

susurrō (Latin) comes from Latin susurrus, from Proto-Indo-European swēr- — heavy.

Ancestry of “susurrō”, step by step

Step	Language	Word	Meaning
1	Latin	susurrus	whisper; murmur
2	Proto-Indo-European	swēr-	heavy

susurrō — Etymology, Origin & Word History | Etymology Explorer