informal
1
: to sit or lie down in a heavy or careless way
They plopped down on the floor. He plopped himself down in the chair.
2
: to drop or place (something or someone) in a heavy or careless way
He plopped the tray down.
3
US
: to pay or spend (money)
I can't afford to just plop down $30 for a T-shirt. He'd already plopped a lot of money down for legal fees.
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Merriam-Webster unabridged
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