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.n. A deep, heavy, continuous, and more or less rattling or jarring sound, as of thunder; a low, jarring roar.n. Confused reports; rumor.n. Confusion; disorder; tumult.n. 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.n. A seat for servants in the rear of a carriage. Also rumble-tumble.