a gruff or angry utterance (suggestive of the growling of an animal)

the sound of growling (as made by animals)

Growling or growl is the low, guttural vocalization produced by predatory animals as a warning to others, as a sign of aggression, or to express anger.

Growling is a multiphonic technique of playing wind instruments (saxophone, trumpet). Growling gives a certain emphasis to the sound and is used in rock, jazz and blues.