plummet
1. [ verb ] drop sharply
Synonyms: plump
Examples:

"The stock market plummeted"

Related terms: drop plump
2. [ noun ] the metal bob of a plumb line
Synonyms: plumb plumb_bob
Related terms: bob plumb_line
Similar spelling:   plumed
  plumate
  planet
  Plymouth
  plum_tree
  planetal