swer-₂

“to buzz, to hum, to swarm”

Debatedsoundanimal

swarm, siren

Root of Old English swearm "swarm of bees", yielding English swarm, possibly related to Greek seirēn‍‌‍‍‍‌‍‍‍‍‌‍‍‌‌‍‌‍‍‍‍‌‍‌‌‌‍‍‍‌‌‍ "siren".

(s)teh₂n-“to thunder”(s)tenh₂-“to crash, to thunder”bʰleh₁-k-“to cry out, to bleat”bʰleh₁-s-“to blow, to blast”bʰormo-“to buzz, murmur, drone”bʰrem-“to hum, to buzz, to make a low sound”derk-mn̥“glance, piercing look”ǵeh₂-“to sing, to chant, to cry out”