—v.
1 intr. a (often foll. by at, about, over) complain peevishly. b be discontented.
2 intr. a utter a dull inarticulate sound; murmur, growl faintly. b rumble.
3 tr. (often foll. by out) utter complainingly.
4 intr. (as grumbling adj.) colloq. giving intermittent discomfort without causing illness (a grumbling appendix).
—n.
1 a complaint.
2 a a dull inarticulate sound; a murmur. b a rumble.
Derivatives:
grumbler n. grumbling adj. grumblingly adv. grumbly adj.
Etymology: obs. grumme: cf. MDu. grommen, MLG grommelen, f. Gmc
Useful english dictionary. 2012.