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Definition of plummet verb from the Oxford Advanced American Dictionary

 

plummet

 verb
verb
NAmE//ˈplʌmət//
 
[intransitive]Verb Forms present simple I / you / we / they plummet
 
he / she / it plummets
 
past simple plummeted
 
-ing form plummeting
 
 
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to fall suddenly and quickly from a high level or position synonym plunge Share prices plummeted to an all-time low. Her spirits plummeted at the thought of meeting him again. The jet plummeted into a row of houses.
See plummet in the Oxford Advanced Learner's Dictionary