plum·met

[pluhm-it]
noun
1.
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.
2.
something that weighs down or depresses.
verb (used without object)
3.
to plunge.

Origin:
1350–1400; (noun) Middle English plommet < Middle French, diminutive of plomb lead; (v.) derivative of the noun See plumb, -et

un·plum·met·ed, adjective


3. fall, dive, drop, swoop.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Plummet is one of our favorite verbs.
So is hornswoggle. Does it mean:
to swindle, cheat, hoodwink, or hoax.
to bark; yelp.
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World English Dictionary
plummet (ˈplʌmɪt) [Click for IPA pronunciation guide]
 
vb , -mets, -meting, -meted
1.  (intr) to drop down; plunge
 
n
2.  another word for plumb bob
3.  a lead plumb used by anglers to determine the depth of water
 
[C14: from Old French plommet ball of lead, from plomb lead, from Latin plumbum]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

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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Example sentences
Urbanization has destroyed cottontail habitat, causing its population to
  plummet.
Most evenings, the crowd of bankers and businessmen groan and gulp their drinks
  as they watch markets plummet.
The theory was put to the test the following day, when the ladder saved him
  from another dark plummet into ice.
The plummet lands upon the striker pin, protruding from the sample holder.
Synonym Game
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