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 a broken power steering pump in a car Cartalk
(possibly of imitative origin) mechanical device for raising/moving water or gas
sound of a drum ("the ceremonial band" by James Reeves, in "Noisy poems" by Jill Bennett)
sound of thin high heels or pumps. also: tap, tap, tap
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