plunk

verb

• 1 [no object] play a keyboard or plucked stringed instrument in an inexpressive way: I got a guitar when I was twelve and started plunking away on it

• 2 [with object] US hit (someone) abruptly: he plunked him in the back

• 3 [with object and adverbial] chiefly North American set down heavily or abruptly:she plunked her pack on top of the bar
• (plunk something down) pay a sum of money:I plunked down £14.95 for the new paperback edition

noun

• 1the sound made by abruptly plucking a string of a stringed instrument: the singing was punctuated by the plunks of the guitar

• 2US a heavy blow.