plunk

a hollow twanging sound

(baseball) hitting a baseball so that it drops suddenly

make or move along with a sound as of a horse's hooves striking the ground

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 steeply; "the stock market plunged"

pull lightly but sharply with a plucking motion; "he plucked the strings of his mandolin"

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