to murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner.-to growl; to snarl in deep tones; as, a lion grumbling over his prey.-to rumble; to make a low, harsh, and heavy sound; to mutter; as, the distant thunder grumbles.-to express or utter with grumbling.-the noise of one that grumbles.-a grumbling, discontented disposition.