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Phrase(s): plump something down
1. to drop a heavy load of something. • She plumped the load of groceries onto the bench and looked through her purse for the keys. • Jill plumped down her packages. 2. to drop something as if it were a heavy load. • He plumped the potatoes down on each plate, making a loud noise each time. • Dave plumped down a huge slab of meat onto the grill.
McGrawhill's American Idioms And Phrasal Verbs