Definition of plumb rule in English:

plumb rule

Line breaks: plumb rule

noun

  • A plumb line attached to a board, used by builders and surveyors.
    More example sentences
    • It is customary in laying blocks to use a plumb rule to ascertain the level alignment of the block which is being positioned on the wall.
    • It is used in a horizontal position as a level and in a vertical position as a plumb rule.

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Pronunciation: ˈmeɪlstrəm
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a powerful whirlpool in the sea