Use a plumb line or known vertical reference point.
Then using plumb marks the contours of the inner surface.
Not to plumb the innermost depths of my character.
Have your party Saturday, get that unplumbed Sunday, I'll be back to plumb this one Monday.
Antonyms
You want a plumb line to run from your ear to your feet.
Truth in a wall that was plumb or a corner that was square.
