plumb

A little mass of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction.

A weight on the end of a long line, used by sailors to determine the depth of water.

The perpendicular direction or position.

Customers turned away from rickety chairs, stands of drawers that refused to open, or had no handles, lop-sided wardrobes whose doors were out of plumb or whose mirrors were cracked.

Truly vertical, as indicated by a plumb line.

Describing an LBW where the batsman is hit on the pads directly in front of their wicket and should be given out.

In a vertical direction; perpendicularly.

Plumb down he drops.

Squarely, directly; deeply, completely.

It hit him plumb in the middle of his face.

Years ago the well plumb dried out, not a drop of water in there since.