Definition of grumble

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