Growl meaning : A deep, rumbling, threatening sound made in the throat by an animal. (by extension) The rumbling sound made by a person's stomach when hungry. (by extension) An aggressive grumbling. (by extension) A low-pitched rumbling sound produced with a wind instrument. To utter a deep guttural sound, as an angry animal; to give forth an angry, grumbling sound. Of a wind instrument: to produce a low-pitched rumbling sound. To send a user a message via the Growl software library. To express (something) by growling. To play a wind instrument in a way that produces a low-pitched rumbling sound.