The meaning of plumb is a lead weight attached to a line and used to indicate a 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. 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: Adverb in a perpendicular or vertical direction (building) a weight, usually of lead, suspended at the end of a line and used to determine water depth or verticality 2
Plumb is used to give emphasis to an adjective or verb that describes a feeling or condition.
