plumb line

noun

Definition of plumb line

  1. 1 :  a line (as of cord) that has at one end a weight (such as a plumb bob) and is used especially to determine verticality

  2. 2 :  a line directed to the center of gravity of the earth :  a vertical line

First Known Use of plumb line

15th century


PLUMB LINE Defined for English Language Learners

plumb line

noun

Definition of plumb line for English Language Learners

  • : a tool that consists of a small, heavy object attached to a string or rope and that is used especially to see if something (such as a wall) is perfectly vertical



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