"rumbles" in the noun sense
1. rumble, rumbling, grumble, grumbling
a loud low dull continuous noise
"they heard the rumbling of thunder"
a servant's seat (or luggage compartment) in the rear of a carriage
3. rumble, gang fight
a fight between rival gangs of adolescents
"rumbles" in the verb sense
1. rumble, grumble
make a low noise
2. grumble, growl, rumble
to utter or emit low dull rumbling sounds
"he grumbled a rude response"
"Stones grumbled down the cliff"
Source: WordNet® (An amazing lexical database of English)
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