definition of
[grumble]

[1] #1 grumble v. [grouch, scold] show one's unhappiness or critical attitude; "He scolded about anything that he thought was wrong"; "We grumbled about the increased work load". wn

[2] #2 grumble v. [murmur, mutter, croak, gnarl] make complaining remarks or noises under one's breath; "she grumbles when she feels overworked". wn

[3] #3 grumble n. [rumble, rumbling, grumbling] a loud low dull continuous noise; "they heard the rumbling of thunder". wn

[4] #4 grumble v. [growl, rumble] to utter or emit low dull rumbling sounds; "he grumbled a rude response"; "Stones grumbled down the cliff". wn

[5] #5 grumble n. [grumbling, murmur, murmuring, mutter, muttering] a complaint uttered in a low and indistinct tone. wn