Similar words: lope, flop, slop, slope, gallop, elope, floppy, sloppy. Meaning: [plɑp /plɒp] 
n. the noise of a rounded object dropping into a liquid without a splash. v. 1. drop something with a plopping sound 2. drop with the sound of something falling into water 3. set (something or oneself) down with or as if with a noise. adv. with a short hollow thud.
n. the noise of a rounded object dropping into a liquid without a splash. v. 1. drop something with a plopping sound 2. drop with the sound of something falling into water 3. set (something or oneself) down with or as if with a noise. adv. with a short hollow thud. 
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31. There was a loud plop as the bag fell to the floor and burst.
32. Of course, you should not simply plop your preschooler in front to the television for hours on end.
33. He fell plop into the river, never to rise again.
34. Once the money's inserted, the crabs drop down to the drawer with an unceremonious plop — something that doesn't happen to, say, bananas in other vending machines (see the video).
35. Wellhung: I'm taking the sopping wet blouse from you. I drop it with a plop.
36. Plop came the ball down to the corner of the green.