Definition of: grumble

(grum′bəl) v. grum·bled, grum·bling v.i.
1. To complain in a surly manner; mutter.
2. To make growling sounds in the throat.
3. To rumble, as thunder.
—v.t.
4. To say with a grumble. See synonyms under COMPLAIN.
—noun
1. A surly, discontented sound or complaint; murmur.
2. plural An ill–tempered, complaining mood.
3. A rumble. [Cf. Du. grommelen <grommen growl]
—grum′bler noun
—grum′bling·ly adverb
—grum′bly adjective