plunk down

plunk down idiom
Throw or place or drop heavily, as in He plunked down the money and walked out, or It was hot work, so after an hour we plunked ourselves down in the shade. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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