plumb

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.

Directly; squarely.

Utterly; completely.

Exactly vertical. synonym: vertical.

Utter; absolute; sheer.

To determine the depth of with a plumb; sound.

To test the verticality or alignment of with a plumb.

To straighten or make perpendicular.