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From The Collaborative International Dictionary of English v.0.48:
Grumble \Grum"ble\, v. i. [imp. & p. p. Grunbled; p. pr. & vb. n. Grumbling.] [Cf. LG. grummeln, grumen, D. grommelen, grommen, and F. grommeler, of German origin; cf. W. grwm, murmur, grumble, surly. [root]35. Cf. Grum, Grim.] 1. To murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner. [1913 Webster] L'Avare, not using half his store, Still grumbles that he has no more. --Prior. [1913 Webster] 2. To growl; to snarl in deep tones; as, a lion grumbling over his prey. [1913 Webster] 3. To rumble; to make a low, harsh, and heavy sound; to mutter; as, the distant thunder grumbles. [1913 Webster]