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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.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  plumb bob, plumb, plummet(adj) the metal bob of a plumb line. 2  plumb(verb) exactly vertical. the tower of Pisa is far out of plumb. 3  plumb(verb) measure the depth of something.  plumb(verb) weight with 1  lead. plumb(verb) examine thoroughly and in great depth.