plop downphrasal verb
Definition of plop down
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.