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plumb bob

 

Definitions from WordNet

Noun plumb bob has 1 sense
  1. plumb bob, plumb, plummet - the metal bob of a plumb line
    --1 is a kind of bob
    --1 is a part of plumb line, perpendicular

Definitions from the Web

Plumb Bob

Noun: A small, pointed metal or lead weight attached to a string, used as a vertical reference line in various building and surveying tasks.

Example Sentence: The construction worker used a plumb bob to ensure the wall was perfectly straight.

Noun: A pointed, conical weight used on the end of a line to determine the depth of water or to obtain vertical measurements.

Example Sentence: The sailor dropped the plumb bob into the ocean to measure the depth of water before anchoring the boat.

Verb: To align or determine the vertical or depth using a plumb bob.

Example Sentence: The engineer had to plumb bob the new column to make sure it was positioned correctly.

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