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English definition of “plumb”

plumb

adjective [after verb]     /plʌm/ specialized
exactly straight, usually describing a vertical surface or line: When you hang a door, you need to make sure that it is both level and plumb.Describing angles, lines and orientations out of plumb not straight vertically: The external wall is out of plumb by half a metre.Describing angles, lines and orientations
(Definition of plumb adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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