|Origin:||From the sound|
plunk [transitive always + adverb/preposition] American English informal
1 also plunk something down
to put or place something somewhere, especially in a noisy, sudden, or careless way [= plonk British English]
plunk something in/on etc something
plans to plunk a theme park on the island
to sit down suddenly or heavily and then relax [= plonk British English]
Why don't you plunk yourself down with a good book?
plunk something ↔ downphrasal verb
She plunked down $250 for a silver necklace.