Verb
set (something or oneself) down with or as if with a noise
Source: WordNetOne of the things I really love about restaurants is that in many ways, they are the ultimate democratic institutions, where you get to walk in the door, plunk down your money, and for however long that you're there, you can be anyone you want to be. Ruth Reichl
He planked the money on the table Source: Internet
He planked himself into the sofa Source: Internet
And, even those fortunate few who can afford to plunk down a load of cash to pay outright for a new home rarely do so. Source: Internet
If I were to plunk down 500 bucks on a piece of hardware right now, it would be the PS5. Source: Internet