The sound a dog makes; growling or snarling, or the act of producing such a sound.
Variant spelling or pronunciation of 'curring,' possibly related to 'cur' (a dog, especially a mixed-breed or inferior dog), with the gerund suffix '-ing.'
The word 'curring' is mostly poetic or archaic—it appears in old literature to show animal sounds, but modern writers usually just use 'growling' or describe the sound more directly.
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