Noun
-
a complaint uttered in a low and indistinct tone
-
a loud low dull continuous noise
"they heard the rumbling of thunder"
Verb
-
make a low noise
"rumbling thunder"
-
to utter or emit low dull rumbling sounds
"he grumbled a rude response"
"Stones grumbled down the cliff"
-
make complaining remarks or noises under one's breath
"she grumbles when she feels overworked"
-
show one's unhappiness or critical attitude
"He scolded about anything that he thought was wrong"
"We grumbled about the increased work load"