A grunting or grumbling sound; to make such a sound, or a variant of grump (to complain).
Likely imitative in origin, meant to sound like a grumbling grunt. Related to 'grump' and 'grunt,' with similar guttural consonants reflecting the harsh sound.
Imitative words like 'grumph' are surprisingly universal—different languages independently created similar-sounding words ('gruñir' in Spanish, 'grunzen' in German) to describe grumbling because the sounds genuinely mimic the behavior.
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