growl

v. 1 a (often foll. By at) make a low guttural sound, usu. Of anger. B murmur angrily. 2 rumble. 3 (often foll. By out) utter with a growl. n. 1 growling sound. 2 angry murmur. 3 rumble. [probably imitative]

v. i. To utter a deep guttural sound, sa an angry dog; to give forth an angry, grumbling sound.