[n] a fight between rival gangs of adolescents
[n] a servant's seat (or luggage compartment) in the rear of a carriage
[n] a loud low dull continuous noise; "they heard the rumbling of thunder"
[v] to utter or emit low dull rumbling sounds; "he grumbled a rude response."; "Stones grumbled down the cliff"
[v] make a low noise, as of thunder