plump_down
1. [ verb ] drop heavily
Synonyms: plank_down plonk_down
Related terms: drop
2. [ verb ] set (something or oneself) down with or as if with a noise
Synonyms: plunk flump plop plonk plunk_down plump plank
Examples:

"He planked the money on the table" "He planked himself into the sofa"

Related terms: set_down plonk
Similar spelling:   plump_in
  plump_up
  plum_pudding
  plumping
  plump_out
  plump_for
  plumb_bob
  plumpness