From 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]
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