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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.
Definition of plumb. 1  transitive verb. 2  1 : to weight with lead. 3  2a : to measure the depth of with a plumbb : to examine minutely and critically plumbing the book's complexities.  3 : to adjust or test by a plumb 1  line. 4 : to seal with lead.  5 [back-formation from plumber] : to supply with or install as 1  plumbing. intransitive  verb.