"plonk down" in Chinese (Simplified)
猛地坐下啪地放下（物品/钱）
Definition
突然重重地坐下，或将某物（如钱、物品）随意重重地放下。
Usage Notes (Chinese (Simplified))
非正式口语，多用于描述不小心或突然的动作，常与“在沙发上”、“放下钱”等搭配。不用于温柔、细致的动作。
Examples
He plonked down on the old armchair after work.
他下班后**猛地坐在**那把旧扶手椅上。
She plonked down the books on the table.
她把书**啪地放在**桌子上。
They plonked down some cash at the store.
他们在商店里**啪地付了**一些现金。
I just got home and plonked down in front of the TV.
我刚到家，就**一屁股坐在**电视前。
He plonked down his backpack like he didn't care if it broke.
他把背包**啪地一扔**，好像不在乎会不会坏。
If you want the tickets, you’ll have to plonk down the money now.
如果你想要票，现在就得**付钱**。