plummet

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plummet

a lead plumb used by anglers to determine the depth of water

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.

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.)
References in periodicals archive ?
MOSCOW: Sternly warning the West it cannot defang the metaphorical Russian bear, a confident-looking President Vladimir Putin promised Thursday to shore up the plummeting ruble and revive the economy within two years.
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
Summary: A blast of wintry weather sweeping the country is expected to send temperatures plummeting to as low as -5C, bringing more snow and ice.
Japanese Machine Orders tumbled in April by the most in five months after domestic production came to a near halt on the back of plummeting global sales.
Those jobs losses plus its plummeting profits sparked a rebellion among angry shareholders after the company awarded massive bonuses to three directors including chief executive John Watson.
Japan's largest banking group, said Thursday it expects to book appraisal losses totaling 288 billion yen on marketable securities for the October-December quarter due to plummeting domestic share prices.