plop

Adverb

• with a short hollow thud
  • plop came the ball down to the corner of the green
    

Noun

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

Verb

• set (something or oneself) down with or as if with a noise
  • He planked the money on the table
    
  • He planked himself into the sofa
    

• drop with the sound of something falling into water

• drop something with a plopping sound

Related words

• Synonyms: 
  plunk , plank , flump , plonk , plump down , plunk down , plump