rumble

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To make a deep, long, rolling sound.
• intransitive verb To move or proceed with a deep, long, rolling sound.
• intransitive verb Slang To engage in a gang fight.
• intransitive verb To utter with a deep, long, rolling sound.
• intransitive verb To polish or mix (metal parts) in a tumbling box.
• noun A deep, long, rolling sound.
• noun A tumbling box.
• noun A luggage compartment or servant's seat in the rear of a carriage.
• noun Pervasive, widespread expression of unrest or dissatisfaction.
• noun A gang fight.

from The Century Dictionary.

• noun A deep, heavy, continuous, and more or less rattling or jarring sound, as of thunder; a low, jarring roar.
• noun Confused reports; rumor.
• noun Confusion; disorder; tumult.
• noun A revolving cylinder or box in which articles are placed to be ground, cleaned, or polished by mutual attrition. Grinding- or polishing-material is added according to the need of the case.
• noun A seat for servants in the rear of a carriage. Also rumble-tumble.
• To make a deep, heavy, continued and more or less jarring sound: as, the thunder rumbles.
• To murmur.
• To move with a deep, hoarse, thundering or jarring sound; roll heavily and noisily.
• To roll about; hence, to create disorder or confusion.
• To cause to make a deep, rattling or jarring sound; rattle.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To cause to pass through a rumble, or shaking machine. See rumble, n., 4.
• noun obsolete A noisy report; rumor.
• noun A low, heavy, continuous sound like that made by heavy wagons or the reverberation of thunder; a confused noise.
• noun A seat for servants, behind the body of a carriage.
• noun A rotating cask or box in which small articles are smoothed or polished by friction against each other.
• intransitive verb To make a low, heavy, continued sound.
• intransitive verb To murmur; to ripple.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• interjection An onomatopoeia describing a rumbling noise
• noun A low pitched irregular noise, such as that of thunder or a hungry stomach.
• noun slang A street fight or brawl.
• noun A rotating cask or box in which small articles are smoothed or polished by friction against each other.
• verb To make a low-pitched noise.
• verb To discover deceitful or underhanded behaviour.
• verb To move while making a rumbling noise.
• verb slang fight, brawl.
• verb transitive To cause to pass through a rumble, or polishing machine.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a loud low dull continuous noise
• noun a fight between rival gangs of adolescents
• verb to utter or emit low dull rumbling sounds
• verb make a low noise
• noun a servant's seat (or luggage compartment) in the rear of a carriage