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Comprehensive
Dictionary Suite
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grumble to make deep, muffled sounds; rumble. [2/4 definitions]
roadster an open automobile of earlier design, with a single seat for two or three passengers and either a large trunk or a rumble seat in the rear.
thunder the loud cracking noise or low distant rumble that follows a flash of lightning. Thunder is caused by the violent movement of air masses. [1/5 definitions]