plop - noun

the noise of a rounded object dropping into a liquid without a splash

plop - verb

• drop something with a plopping sound
• drop with the sound of something falling into water
• set (something or oneself) down with or as if with a noise

plop - adverb

• with a short hollow thud

plop - thesaurus

flump   plank   plonk   plump   plunk