plump down

plump down (http://definr.com/plump down)

     v 1: drop heavily [syn: plonk down, plank down]
     2: set (something or oneself) down; "He planked the money on
        the table"; "He planked himself into the sofa" [syn: plank,
         flump, plonk, plop, plunk, plunk down, plump]