—v.
1 intr. a (often foll. by at) (esp. of a dog) make a low guttural sound, usu. of anger. b murmur angrily.
2 intr. rumble.
3 tr. (often foll. by out) utter with a growl.
—n.
1 a growling sound, esp. made by a dog.
2 an angry murmur; complaint.
3 a rumble.
Derivatives:
growlingly adv.
Etymology: prob. imit.
Useful english dictionary. 2012.