a soft sound like that of something solid dropping lightly into a liquid

The stone fell into the water with a plop. 那颗石子咚的一声掉进了水里。

to sit down or land heavily or without taking care, or to put something down without taking care

He came and plopped down next to me. 他走过来，在我旁边重重坐下。

Lynn plopped a paper cup down beside her. 琳恩把一个纸杯随手放在她身边。

to fall with a soft sound

I noticed drops of water plopping onto the carpet. 我注意到水正嘀嘀嗒嗒往地毯上滴。