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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, fair, plummet, plum, plumb bob, vertical, fairly, upright, horizontal

straight, perpendicular, unbent, undeviating, unswerving, direct

straighten, unbend

Usage examples:

• I had theories about this child- business myself, at one time, but my pipe of illusion has plumb gone out. - "The Prairie Mother", Arthur Stringer.
• But I’ m plumb sick of it. - "The Heart of Canyon Pass", Thomas K. Holmes.
• As soon after hit's plumb dark as he can git there- will ye say that? - "Judith of the Cumberlands", Alice MacGowan.