PLUMP

down [phrasal verb] [usually + adverb or preposition] [informal] - to (cause to) sit down suddenly and heavily, or to put (something) down suddenly and without taking careShe plumped down next to me on the sofa. [I]He rushed into the room and plumped himself down in a chair. [T]Joan sat down on the bus, and plumped her bags down next to her. [M]