How to use plumb in a sentence. Plumb verb [t] (deep) engineering specialized to measure how deep something is, especially water to understand or discover all about something: (building) a weight, usually of lead, suspended at the end of a line and used to determine water depth or verticality 2 (building) the perpendicular position of a freely suspended plumb line (esp in the phrases out of plumb, off plumb) Plumb is used to give emphasis to an adjective or verb that describes a feeling or condition. Adverb in a perpendicular or vertical direction
[countable] building, surveying a small mass of lead hung on a line and used to measure the depth of water or to make sure a line is straight up and down.
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