plumb bob

noun

Definition of plumb bob

  1. :  the metal bob of a plumb line

First Known Use of plumb bob

1836


PLUMB BOB Defined for English Language Learners

plumb bob

noun

Definition of plumb bob for English Language Learners

  • : a usually small, heavy object that is used to make a string or rope hang straight : the heavy object that is part of a plumb line

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