n. 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