/plungk/ , v.t.
1. to pluck (a stringed instrument or its strings); twang: to plunk a guitar.
2. to throw, push, put, drop, etc., heavily or suddenly; plump (often fol. by down ): Plunk down your money. She plunked herself down on the seat.
3. to push, shove, toss, etc. (sometimes fol. by in, over, etc.): to plunk the ball over the net; to plunk a pencil into a drawer.
v.i.
4. to give forth a twanging sound.
5. to drop heavily or suddenly; plump (often fol. by down ): to plunk down somewhere and take a nap.
n.
6. act or sound of plunking.
7. Informal. a direct, forcible blow.
8. Slang. a dollar.
adv.
9. Informal. with a plunking sound.
10. Informal. squarely; exactly: The tennis ball landed plunk in the middle of the net.
[ 1760-70; expressive word akin to PLUCK ]