Plumb word meaning and definition

[noun] the metal bob of a plumb line
[adv] (slang) completely; used as intensifiers; "clean forgot the appointment"; "I'm plumb (or plum) tuckered out"
[adv] (informal) exactly; "fell plumb in the middle of the puddle"
[adv] conforming to the direction of a plumb line
[adjective] exactly vertical; "the tower of Pisa is far out of plumb"
[verb] adjust with a plumb line so as to make vertical
[verb] examine thoroughly and in great depth
[verb] measure the depth of something
[verb] weight with lead

\Plumb\, n. [F. plomb, L. plumbum lead, a leaden ball or bullet; cf. Gr. ?, ?, ?. Cf. {Plummet}, {Plunge}.] A little mass or weight of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction; a plummet; a plumb bob. See {Plumb line}, below. {Plumb bob}. See {Bob}, 4. {Plumb joint}, in sheet-metal work, a lap joint, fastened by solder. {Plumb level}. See under {Level}. {Plumb line}.
(a) The cord by which a plumb bob is suspended; a plummet.
(b) A line directed to the center of gravity of the earth. {Plumb rule}, a narrow board with a plumb line, used by builders and carpenters.
\Plumb\, a. Perpendicular; vertical; conforming the direction of a line attached to a plumb; as, the wall is plumb.
\Plumb\, adv. In a plumb direction; perpendicularly. ``Plumb down he falls.'' --Milton.
\Plumb\, v. t. [imp. & p. p. {Plumbed}; p. pr. & vb. n. {Plumbing}.] 1. To adjust by a plumb line; to cause to be perpendicular; as, to plumb a building or a wall. 2. To sound with a plumb or plummet, as the depth of water; hence, to examine by test; to ascertain the depth, quality, dimension, etc.; to sound; to fathom; to test. He did not attempt to plumb his intellect. --Ld. Lytton. 3. To seal with lead; as, to plumb a drainpipe. 4. To supply, as a building, with a system of plumbing.

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