[syn: grumble, growl, rumble]
The Collaborative International Dictionary of English v.0.48:
Growl \Growl\, v. t.
   To express by growling. --Thomson.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Growl \Growl\, n.
   The deep, threatening sound made by a surly dog; a grumbling
   sound.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Growl \Growl\ (groul), v. i. [imp. & p. p. Growled (grould);
   p. pr. & vb. n. Growling.] [D. grollen to grunt, murmur, be
   angry; akin to G. grollen to be angry.]
   To utter a deep guttural sound, as an angry dog; to give
   forth an angry, grumbling sound. --Gay.
   [1913 Webster]
WordNet (r) 3.0 (2006):
growl
    n 1: the sound of growling (as made by animals) [syn: growl,
         growling]
    v 1: to utter or emit low dull rumbling sounds; "he grumbled a
         rude response"; "Stones grumbled down the cliff" [syn:
         grumble, growl, rumble]
Moby Thesaurus II by Grady Ward, 1.0:
127 Moby Thesaurus words for "growl":
   air a grievance, bark, bawl, beef, belch, bellow, bellyache, bitch,
   blare, blat, blubber, boom, booming, bray, breathe, burr, buzz,
   cackle, cannonade, caw, chant, chirp, chirr, clamor, clang,
   clangor, clank, clash, color, complain, coo, crab, craunch, croak,
   crow, crump, crunch, drawl, echo, exclaim, flush, flute, fret,
   fret and fume, frown, fuss, gasp, glare, glower, gnarl, grind,
   gripe, groan, grouch, grouse, growling, grumble, grumbling, grunt,
   hiss, holler, howl, jangle, jar, keen, kick, lilt,
   lodge a complaint, look daggers, lower, mantle, moan, mumble,
   murmur, mutter, pant, peal, pipe, raise a howl, rasp, reboation,
   rebound, redden, reecho, register a complaint, resound, resounding,
   reverberation, roar, roll, rumble, rumbling, scowl, scranch,
   scrape, scratch, scream, screech, scrunch, shriek, sibilate, sigh,
   sing, snap, snarl, snore, snort, sob, sough, spit, squall, squawk,
   squeal, take on, thunder, thundering, trumpet, twang, wail, warble,
   whine, whisper, whistle, yap, yawp, yell, yelp