Definition of plumbs:
(n) :
A little mass of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction.
(n) :
(nautical) A weight on the end of a long line, used by sailors to determine the depth of water.
(n) :
The perpendicular direction or position.
(adj) :
Truly vertical, as indicated by a plumb line.
(adj) :
(cricket) Describing an LBW where the batsman is hit on the pads directly in front of their wicket and should be given out.
(adv) :
In a vertical direction; perpendicularly.