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[pluhm-it] /ˈplʌm ɪt/
Also called plumb bob. a piece of lead or some other weight attached to a line, used for determining perpendicularity, for sounding, etc.; the bob of a plumb line.
something that weighs down or depresses.
verb (used without object)
to plunge.
1350-1400; (noun) Middle English plommet < Middle French, diminutive of plomb lead; (v.) derivative of the noun See plumb, -et
Related forms
unplummeted, adjective
3. fall, dive, drop, swoop. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for plummet
  • When online learning is regulated differently, its price will plummet.
  • Overfishing has caused fish populations and catches to plummet.
  • When you look at how the mortality rates plummet with the simple act of giving out a net.
  • New book sales plummet as used books and examination copies flood the market.
  • If consumer-price inflation is about to plummet so far below its target, more rate cuts will be coming soon.
  • However, when colder years arrive, many northern birds are unable to survive and fringe populations plummet.
  • Diversity will plummet and exotic diseases will continue to plague the survivors.
  • The slowing economy is pushing many state budgets into the red as tax revenues plummet.
  • But during the last century oyster populations began to plummet.
  • The overall market is unlikely to plummet when mining and energy stocks are holding up so well.
British Dictionary definitions for plummet


verb -mets, -meting, -meted
(intransitive) to drop down; plunge
another word for plumb bob
a lead plumb used by anglers to determine the depth of water
Word Origin
C14: from Old French plommet ball of lead, from plomb lead, from Latin plumbum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for plummet
late 14c., "ball of lead, plumb of a bob-line," from O.Fr. plomet, dim. of plom "sounding lead" (see plumb). The verb is first recorded 1620s, originally "to fathom, take soundings," from the noun. Meaning "to fall rapidly" first recorded 1939.
Online Etymology Dictionary, © 2010 Douglas Harper
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