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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.
Word Origin & History. plummet late 14c., ball of lead, plumb of a bob-line, from O.Fr. plomet, dim. of plom sounding lead (see plumb). The verb is first recorded 1620s, originally to fathom, take soundings, from the noun. Meaning to fall rapidly first recorded 1939.