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plummet

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plummet

a lead plumb used by anglers to determine the depth of water
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

plummet

[′pləm·ət]
(engineering)
A loose-fitting metal plug in a tapered rotameter tube which moves upward (or downward) with an increase (or decrease) in fluid flow rate upward through the tube. Also known as float.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

plumb bob, plummet

A shaped metal weight which is suspended from the lower end of a line to determine the vertical. (See illustration p. 744.)
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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References in periodicals archive
Following Putin's performance, the Russian currency traded between 60 and 62 rubles to the dollar, roughly the same level as late Wednesday, when it rallied 12 percent after plummeting to a historic low of 80 rubles per dollar.
Delhi: Faced with plummeting rupee woes, Indian Finance Minister P Chidambaram Monday met Indian Prime Minister Manmohan Singh to discuss the economic situation, even as Reserve Bank of India (RBI) Governor D Subbarao has been called to deliberate on the strategy to tackle the problem.
* DEATH PLUNGE: Glenn Hudson, seen with daughter Emma, died after plummeting 150ft
In addition to the plummeting share values of cross-holdings among domestic companies due to the global financial crisis, MUFG has also been hit by the increasing cost of disposing of bad loans left by a growing number of failed firms.
With fuel prices going through the roof, gas/electricty bills going up, interest rates soaring, house prices plummeting.
I have, especially after a new story about some poor soul falling down an elevator shaft after the door had been left open or the elevator itself suddenly plummeting to the basement.
It aims first to be a paean to a mayor Siegel believes has not received enough credit; although Giuliani became a beloved national figure in the aftermath of the 9/11 attacks, Siegel remembers and (rightly, in my opinion) resents the controversies and plummeting popularity that dimmed his second term.
Top-of-the-food-chain fish have always been the least numerous; so, overfishing such fish quickly sent their populations plummeting (SN: 7/26/03, p.
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