In your sentence, 'rumble' means to move slowly, often with a low sound (as in the case of thunder or an old car).
You can find examples here: http://learnersdictionary.com/definition/rumble
March 14, 2019
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Moving closer (to us) WITH A LOT OF NOISE. To rumble means to move while making a lot of noise.
March 15, 2019
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