To adjust by a plumb-line; to set in a perpendicular direction; as, to plumb a building or awall.

A mass of lead attached to a line, and used to ascertain a perpendicular position of buildings and the like. But the word as a noun is seldom used, except in composition. [See PIumb- line. I .

Perpendicular, that is, standing according to a plumb-line. The post of the house or the wall is plumb.

In a perpendicular direction; in a line perpendicular to the plane of the horizon. The wall stands plumb. Plumb down he falls.

Directly; suddenly; at once; as a falling mass; usually pronounced plump. He fell plumb into the water.

To sound with a plummet, as the depth of water.