Proto-IE: *swer-
Meaning: to sound
Old Indian: svárati `to sound, resound'
Latin: susurrus, -ī `Zischen, Flüstern', susurrāre `zischen, flüstern, summen, sumsen', absurdus, -a `missklingend, ungereimt, töricht'
Russ. meaning: звучать как-то
References: WP II 527 f