plummet

[ pluhm-it ]
/ ˈplʌm ɪt /

noun

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.

Origin of plummet

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

Related forms

un·plum·met·ed, adjective
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British Dictionary definitions for plummet

plummet

/ (ˈplʌmɪt) /

verb -mets, -meting or -meted

(intr) to drop down; plunge

noun

another word for plumb bob
a lead plumb used by anglers to determine the depth of water

Word Origin for plummet

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