Definitions

1. verb

to make a dull, hollow sound, typically when something falls or hits a surface

“She heard a loud plunk as the basketball hit the water.”

2. noun

the sound of something falling or hitting a surface with a dull, hollow sound

“The plunk of the piano strings was beautiful.”

3. interjection

an expression used to describe the act of something falling or hitting a surface with a dull, hollow sound

“Plunk! The apple landed in the bucket.”