mutter
n 1: a low continuous indistinct sound [syn: {muttering}, {murmur},
{murmuring}, {murmuration}]
2: a complaint uttered in a low and indistinct tone [syn: {grumble},
{grumbling}, {murmur}, {murmuring}, {muttering}]
v 1: talk indistinctly; usually in a low voice [syn: {mumble}, {maffle},
{maunder}, {mussitate}]
2: complain quietly [syn: {murmur}, {grumble}, {croak}, {gnarl}]