One of the mysteries of the English language finally explained.
A plumb line attached to a board, used by builders and surveyors.
- ‘It is used in a horizontal position as a level and in a vertical position as a plumb rule.’
- ‘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.’
plumb rule/ˈpləm ˌro͞ol/
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