plumb bob

noun
plummet ( def 1 ).

Origin:
1825–35

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
plumb bob
 
n
the weight, usually of lead, at the end of a plumb line; plummet

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Plumb bob is always a great word to know.
So is lollapalooza. Does it mean:
a fool or simpleton; ninny.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Example sentences
Verifies vertical alignment of posts with plumb bob or spirit level.
Check line and grade of each pipe length with grade rod and plumb bob.
The deflection of the vertical is the departure of a plumb bob's actual
  pointing from the ellipsoidal normal direction.
The plumb bob accurately transfers measured points above the ground to
  comparable points on the ground.
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