Coin-into-a-fountain sound (4)

I believe the answer is:

plop

(Other definitions for plop that I've seen before include "Sound of a stone hitting water" , "Sound of a stone landing in water" , "Noise of a small object dropping into water" , "Sound of object falling into water without a splash" , "Report making little splash" .)

I've seen this clue in the USA Today.

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