Source : Webster's Revised Unabridged Dictionary (1913)

Rumble \Rum"ble\, v. t.
   To cause to pass through a rumble, or shaking machine. See
   {Rumble}, n., 4.

Rumble \Rum"ble\, v. i. [OE. romblen, akin to D. rommelen, G.
   rumpeln, Dan. rumle; cf. Icel. rymja to roar.]
   1. To make a low, heavy, continued sound; as, the thunder
      rumbles at a distance.

            In the mean while the skies 'gan rumble sore.
                                                  --Surrey.

            The people cried and rombled up and down. --Chaucer.

   2. To murmur; to ripple.

            To rumble gently down with murmur soft. --Spenser.

Rumble \Rum"ble\, n.
   1. A noisy report; rumor. [Obs.]

            Delighting ever in rumble that is new. --Chaucer.

   2. A low, heavy, continuous sound like that made by heavy
      wagons or the reverberation of thunder; a confused noise;
      as, the rumble of a railroad train.

            Clamor and rumble, and ringing and clatter.
                                                  --Tennyson.

            Merged in the rumble of awakening day. --H. James.

   3. A seat for servants, behind the body of a carriage.

            Kit, well wrapped, . . . was in the rumble behind.
                                                  --Dickens.

   4. A rotating cask or box in which small articles are
      smoothed or polished by friction against each other.

Source : WordNet®

rumble
     n 1: a loud low dull continuous noise; "they heard the rumbling
          of thunder" [syn: {rumbling}, {grumble}, {grumbling}]
     2: a servant's seat (or luggage compartment) in the rear of a
        carriage
     3: a fight between rival gangs of adolescents [syn: {gang fight}]

rumble
     v 1: make a low noise; "rumbling thunder" [syn: {grumble}]
     2: to utter or emit low dull rumbling sounds; "he grumbled a
        rude response"; "Stones grumbled down the cliff" [syn: {grumble},
         {growl}]