Plunk Very Common

a hollow twanging sound

(baseball) hitting a baseball so that it drops suddenly

The dull thud of something landing on a surface.

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"

To drop or throw something heavily onto or into something else, so that it makes a dull sound.

with a short hollow thud

"plop came the ball down to the corner of the green"

A surname​.