The Oxford Thesaurus An A-Z Dictionary of Synonyms - murmurn.

1) undercurrent, undertone, background noise or sound, rumble, rumbling, mumble, mumbling, drone, droning, buzz, buzzing, murmuration, murmuring, hum, humming, whispering, Formal susurration or susurrus: They spoke in low voices, barely audible above the murmur of the mourning doves. 2) muttering, complaining, complaint, grumble, grumbling, Colloq grousing, grouse: We have heard not any murmurs since everyone had an increase in salary. --v. 3) mumble, mutter, whisper: He murmured into her ear something about being pleased to see her. 4) complain, grumble, mutter, moan, lament, wail, Colloq grouse: Employees will always find something to murmur about.