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Definition of plumb bob

plumb bob

Plural:plumb bobs
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• noun

1

A pointed weight attached to the end of a string, used by builders, carpenters, and surveyors to establish a perfectly vertical line of reference.

Example

"Before pouring the concrete pillars, the engineers dropped a plumb bob to ensure the formwork was exactly vertical."

Synonyms
View all synonyms for plumb bob

• Nearby Words

plug
plum
plumb
plumb bob
plumbago
plumcot
plumed basilisk

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Plumb bob. In Wordmom Dictionary. Retrieved Oct 18, 2026, from https://wordmom.com/dictionary/plumb%20bob
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