WordWeb Online

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

Derived forms: plunked down, plunking down, plunks down

Type of: place down, put down, set down