plunk

Concise Oxford English Dictionary © 2008 Oxford University Press:
plunk /plʌŋk/ informal

▶verb

• 1 play a keyboard or plucked stringed instrument in an inexpressive way.

• 2 chiefly N. Amer. set down heavily or abruptly.

• 3 US hit (someone) abruptly.

▶noun

• 1 a plunking sound.

• 2 N. Amer. an act of setting something down heavily.

• 3 US a heavy blow.

– origin C19: prob. imitative.