What is the meaning of plunk?

noun

• A hollow twanging sound.
• Baseball) hitting a baseball so that it drops suddenly.
  • synonyms: plunker

verb

• Make or move along with a sound as of a horse's hooves striking the ground.
  • synonyms: clop, clump, clunk
• Set (something or oneself) down with or as if with a noise.
  • usage: "He planked the money on the table"; "He planked himself into the sofa"
  • synonyms: plank, flump, plonk, plop, plump down, plunk down, plump
• Drop steeply.
  • usage: "the stock market plunged"
  • synonyms: dive, plunge
• Pull lightly but sharply with a plucking motion.
  • usage: "he plucked the strings of his mandolin"
  • synonyms: pluck, pick

adverb

• With a short hollow thud.
  • usage: "plop came the ball down to the corner of the green"
  • synonyms: plop