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plumb meaning, definition, what is plumb: to supply a building or a device with water pipes, or to connect a building or a deviceâ¦. Learn more.
Wiktionary(5.00 / 1 vote)Rate this definition: plumb(Noun) A little mass of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction. plumb(Noun) A weight on the end of a long line, used by sailors to determine the depth of water. plumb(Verb) To determine the depth, generally of a liquid; to sound.