Definition of "rumbling" []

• Deep and slow sounding. (adjective)
• The sound of complaint. (noun)
• Present participle of rumble. (verb)

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• "That left behind 97% of what they call the rumbling radioactive volcano including something like 216 tons of highly radioactive graphite and uranium."
• "As he bit into a roast beef sandwich aboard an Acela train rumbling toward New York recently, he looked out the window and observed: "We've got a hard road to go, but we've been down hard roads like this.""
• "Resulting in much rumbling from the allies, but no serious intervention."