- a small mass of lead or other heavy material, as that suspended by a line and used to measure the depth of water or to ascertain a vertical line.
- true according to a plumb line perpendicular.
- downright or absolute.
- in a perpendicular or vertical direction.
- exactly, precisely, or directly.
- completely or absolutely: She was plumb mad. You're plumb right.
- to test or adjust by a plumb line.
- to make vertical.
- horn (def. 32).
- to sound with or as with a plumb line.
- to measure (depth) by sounding.
- to examine closely in order to discover or understand: to plumb someone's thoughts.
- to seal with lead.
- to weight with lead.
- to provide (a house, building, apartment, etc.) with plumbing.
- to work as a plumber.
- not corresponding to the perpendicular; out of true.
- British historian.
- a weight, usually of lead, suspended at the end of a line and used to determine water depth or verticality
- the perpendicular position of a freely suspended plumb line (esp in the phrases out of plumb, off plumb)
- (intensifier)
- in a vertical or perpendicular line
- (intensifier)
- exactly; precisely (also in the phrase plumb on)
- to test the alignment of or adjust to the vertical with a plumb line
- to undergo or experience (the worst extremes of misery, sadness, etc)
- to understand or master (something obscure)
- to connect or join (a device such as a tap) to a water pipe or drainage system
