Read the dictionary definition of plunk. All definitions for this word.
1. (baseball) hitting a baseball so that it drops suddenly
2. a hollow twanging sound
3. pull lightly but sharply with a plucking motion
1. he plucked the strings of his mandolin
4. set (something or oneself) down with or as if with a noise
1. He planked the money on the table
2. He planked himself into the sofa
5. drop steeply
1. the stock market plunged
6. make or move along with a sound as of a horse's hooves striking the ground
7. with a short hollow thud
1. plop came the ball down to the corner of the green