Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: From the sound

plunk

 verb
     
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
2

plunk (yourself) down

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 ↔ down

phrasal verb
to spend an amount of money on something:
She plunked down $250 for a silver necklace.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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