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Definition
exactly vertical or straightMore rarely, plumb can also be sued as a verb to refer to doing plumbing. It can also refer to the weight at the end of a line that is used to see if something is straight. Finally, it can be used as an intensifier, as when someone expresses that they are tired by saying, "I'm plumb wiped out." The last use may also be spelled like the fruit (plum).
- Don't assume ghosts if your door swings by itself. It is probably not plumb.
plumb = exactly vertical or straight
- Using a pebble on a horsehair string, he dropped it deep in the hole and let it hung to see if the hole was plumb to the earth.Robert Newton Peck -- A Day No Pigs Would Die
- the tower of Pisa is far out of plumb
plumb = exactly vertical
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