Sound of a beating heart. This seems the most common spelling, used in medical texts. Also: dup-dup; ba bum; plop-plop; thud-thud; pop-pop; Sometimes the heart is said to throb and throb is also thought to have imitative origin. (Yahoo Answers, 1, 2)
human disease pounding pump heartbeat
sound of pounding ("Misoso: Once Upon a Time Tales from Africa", by Verna Aardema)
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