Made a deep, rolling sound like distant thunder; or moved slowly with heavy sounds, or discovered someone's secret.
From Middle English and Old Dutch 'rommelen,' an imitative word for deep rolling sounds. The '-ed' ending shows past tense. The word has always been connected to low-frequency sound and motion.
Your stomach rumbles because of gas and fluid moving through your digestive system, and the sound is the same principle as thunder—air rushing through a confined space creates that distinctive rolling sound!
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