rumble

(noun) a loud low dull continuous noise. Synonyms: rumbling, grumble, grumbling. Example: "They heard the rumbling of thunder."

(noun) a servant's seat (or luggage compartment) in the rear of a carriage.

(noun) a fight between rival gangs of adolescents. Synonyms: gang fight.

(verb) make a low noise. Synonyms: grumble. Example: "Rumbling thunder."

(verb) to utter or emit low dull rumbling sounds. Synonyms: grumble, growl. Examples: "He grumbled a rude response." "Stones grumbled down the cliff."