Drop sharply; "The stock market plummeted".
Verbs of walking, flying, swimming.
Set (something or oneself) down with or as if with a noise; "He planked the money on the table"; "He planked himself into the sofa".
Verbs of touching, hitting, tying, digging.
Make fat or plump; "We will plump out that poor starving child".
Verbs of eating and drinking.