grumble (
http://definr.com/grumble)
n 1: a loud low dull continuous noise; "they heard the rumbling
of thunder" [syn:
rumble,
rumbling,
grumbling]
2: a complaint uttered in a low and indistinct tone [syn:
grumbling,
murmur,
murmuring,
mutter,
muttering]
v 1: show one's unhappiness or critical attitude; "He scolded
about anything that he thought was wrong"; "We grumbled
about the increased work load" [syn:
grouch,
scold]
2: complain quietly [syn:
murmur,
mutter,
croak,
gnarl]
3: to utter or emit low dull rumbling sounds: "he grumbled a
rude response." "Stones grumbled down the cliff" [syn:
growl,
rumble]
4: make a low noise, as of thunder [syn:
rumble]