·adv In a plumb direction; perpendicularly.
II. Plumb ·vt To seal with lead; as, to plumb a drainpipe.
III. Plumb ·vt To supply, as a building, with a system of plumbing.
IV. Plumb ·vt To adjust by a plumb line; to cause to be perpendicular; as, to plumb a building or a wall.
V. Plumb ·adj Perpendicular; vertical; conforming the direction of a line attached to a plumb; as, the wall is plumb.
VI. Plumb ·noun 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.
VII. Plumb ·vt 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.