plunk

nouns

a hollow twanging sound
is a type of (narrower)
the sudden occurrence of an audible event
"the sound awakened them"
(baseball) hitting a baseball so that it drops suddenly

verbs

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"

adverbs

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