To utter a deep guttural sound of anger or hostility, as a dog or a bear; hence, to emit a sharp rumbling sound, as the forces of nature.Hence To speak in an offended or discontented tone; find fault; grumble: as, he growled at being disturbed.To make reluctant; cause to grudge: used reflexively.To express by growling or grumbling.n. A deep snarling and threatening sound from the throat, expressive of the hostility of an animal; hence, the grumbling or faultfinding of an offended or discontented person.