Past tense of grumble; complained in a low, continuous voice or made a deep rolling sound.
Grumble comes from Middle Dutch or Low German origins (grommelen), meaning 'to murmur' or 'to complain.' The -ed ending marks past tense, with the word dating back to at least the 1500s in English.
Grumble is onomatopoetic—the word actually sounds like what it means! That rolling 'gr' and 'umb' combination mimics the actual sound a grumbling person makes, which is why the word feels so satisfying to say.
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