plummet
definition
to fall or drop sharply in amount or value
example
After the economic crisis, stock prices began to plummet, causing widespread panic among investors.
synonyms
dropplungefall
word origin — The word 'plummet' originates from the late Middle English term 'plummete,' which comes from the Old French 'plommet,' meaning 'a weight' or 'plumb bob,' derived from Latin 'plumbum,' meaning 'lead.'