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90s Slang You Should Know

plumb line

a cord with a lead bob attached to one end, used to determine perpendicularity, the depth of water, etc.
Compare plumb (def 1).
Origin of plumb line
First recorded in 1530-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for plumb line

plumb line

a string with a metal weight at one end that, when suspended, points directly towards the earth's centre of gravity and so is used to determine verticality, the depth of water, etc
another name for plumb rule
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
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plumb line in Science
plumb line
A line regarded as directed exactly toward the Earth's center of gravity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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