plump (someone/something) down
phrasal verb with plump verb [ T ] uk/plʌmp/ us/plʌmp/
informal
重重地坐下；（随意地）把…重重地放下
to sit down suddenly and heavily, or to put an object or child down suddenly and without taking care
She plumped down next to me on the sofa. 她挨着我一屁股坐在沙发上。
He rushed in and plumped himself down in a chair. 他冲进房间，一屁股坐到椅子上。
Joan sat down at the front of the bus, and plumped her bags down beside her. 琼在公共汽车前部坐下，把行李放在身边。