WordWeb Online

1. Fall heavily
   - flump down
    
2. Set (something or oneself) down with or as if with a noise
   "He flumped the money on the table";
   - plank [informal], plonk [informal], plop, plunk, plump down, plunk down, plump, slap

Derived forms: flumped, flumps, flumping

Type of: drop, place down, put down, set down

Encyclopedia: Flump