1. See plumb bob.
2. Something that weighs down or oppresses; a burden.
intr.v. plum·met·ed, plum·met·ing, plum·mets
1. To fall straight down; plunge.
2. To decline suddenly and steeply: Stock prices plummeted.
[Middle English plomet, from Old French, ball of lead, diminutive of plom, plomb, sounding lead, from Latin plumbum.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.