"whisper, murmur," c.1400, from Latin susurrationem (nominative susurratio), from past participle stem of susurrare, from susurrus "murmur, whisper," a reduplication of the PIE imitative base *swer- (2) "to buzz, whisper" (cf. Sanskrit svarati "sounds, resounds," Greek syrinx "flute," Latin surdus "dull, mute," Old Church Slavonic svirati "to whistle," Lithuanian surmo "pipe, shawm," German schwirren "to buzz," Old English swearm "swarm").