The meaning of PLUMB is a lead weight attached to a line and used to indicate a vertical direction. 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:

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Plumb is used to give emphasis to an adjective or verb that describes a feeling or condition.

PLUMB definition: a small mass of lead or other heavy material, as that suspended by a line and used to measure the depth of water or to ascertain a vertical line. See examples of plumb …

Dec 11, 2025 · plumb (third-person singular simple present plumbs, present participle plumbing, simple past and past participle plumbed) To determine the depth, generally of a liquid; to sound.

1. (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 …

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plumb /plʌm/ n. [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.