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Definition of plumb:

  1. 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 line, below.
  2. In a plumb direction; perpendicularly.
  3. Perpendicular; vertical; conforming the direction of a line attached to a plumb; as, the wall is plumb.
  4. To adjust by a plumb line; to cause to be perpendicular; as, to plumb a building or a wall.
  5. To seal with lead; as, to plumb a drainpipe.
  6. 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.
  7. To supply, as a building, with a system of plumbing.

Synonyms:

clean, fairly, horizontal, plum, vertical, plumb bob, upright, plummet, perpendicular, fair, upright.

Usage examples: