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

unplummeted, adjective

3. fall, dive, drop, swoop.
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World English Dictionary
plummet (ˈplʌmɪt)
vb , -mets, -meting, -meted
1.  (intr) to drop down; plunge
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
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Word Origin & History

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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