plummet
[verb]
Synonyms: plunge, crash, descend, dive, drop down, fall, nose-dive, tumble

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Antonyms: skyrocket, soar
Contrasted words: increase, rise, shoot up
Related Idioms: take a sudden downturn (or downtrend)
Related Words: decline, decrease, descend, sink, dump, precipitate, collapse, crash

[TahlilGaran] English Synonym Dictionary ▲

plum‧met /ˈplʌmət, ˈplʌmɪt/ (also plummet down) verb [intransitive]
[Date: 1900-2000; Origin: plummet 'metal weight on a plumb line' (14-21 centuries), from Old French plommet 'small ball of lead', from plomb; ⇒ plumb¹]

1. to suddenly and quickly decrease in value or amount Synonym : plunge
plummet from something to something
Profits plummeted from £49 million to £11 million.
House prices have plummeted down.

2. to fall suddenly and quickly from a very high place Synonym : plunge:
The plane plummeted towards the Earth.

[TahlilGaran] Dictionary of Contemporary English ▲