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.
- A weight on the end of a line, used to determine water depth.
- A weight on the end of a line, used especially by masons and carpenters to establish a true vertical.
- In a vertical or perpendicular line.
- Informal Directly; squarely: fell plumb in the middle of the puddle.
- Informal Utterly; completely: plumb worn out. See Note at right.
- Exactly vertical. See Synonyms at vertical.
- Informal Utter; absolute; sheer: a plumb fool.
- To determine the depth of with a plumb; sound.
- To test the verticality or alignment of with a plumb.
- To straighten or make perpendicular: plumb up the wall.
- To examine closely or deeply; probe: "Shallow ideas are plumbed and discarded” ( Gilbert Highet).
- To seal with lead.
- To work as a plumber.
- out of Not vertical.