From Longman Dictionary of Contemporary Englishplunkplunk /plʌŋk/ verb [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 SYN plonk British Englishplunk something in/on etc something plans to plunk a theme park on the island2 → plunk (yourself) down → plunk something ↔ down→ See Verb table
Examples from the Corpus
plunk• I was too cheap to plunk down $25 for a one-hour lesson.• I plunk down a dollar and confront my deepest fears.• Marketers usually plunk down the equivalent of $ 40,000 or so in cash, goods or services for placement.• The beverage giant wants you to plunk down your money and decide for yourself.Origin plunk (1800-1900) From the sound 