v. & n.
--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.