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    plumb
    /plʌm/

    verb

    • 1. measure (the depth of a body of water): "I plumbed the depth and found the bottom of the shelf to be seven metres down"
    • 2. test (an upright surface) to determine the vertical: "they are valuable aids in plumbing the frames and keeping the side of the ship fair"

    noun

    • 1. a ball of lead or other heavy object attached to the end of a line for finding the depth of water or determining the vertical on an upright surface.

    adverb

    adjective

    • 1. vertical: "ensure that the skirting is straight and plumb"

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