plunk down
plunk down {v.}, {informal}
1. To drop down; fall.
After walking a mile we plunked down on a bench to rest.
2. To drop something noisily or firmly.
He plunked the heavy suitcase down at the station.
3. To pay out, primarily an excessive amount
I had to plunk down $55 for a concert ticket.
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Source: A Dictionary of American Idioms
