Definition of: growl

(groul) noun
1. The guttural threatening sound made by an angry animal.
2. Angry fault-finding; grumbling.
—v.i.
1. To utter a growl, as an angry dog.
2. To grumble or find fault in a surly manner.
3. To rumble, as distant thunder.
—v.t.
4. To express by growling. See synonyms under COMPLAIN. [? <OF grouler mumble <Gmc.]