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Adjective
- exactly vertical
- the tower of Pisa is far out of plumb
Adverb
- exactly
- fell plumb in the middle of the puddle
- conforming to the direction of a plumb line
- completely; used as intensifiers
- clean forgot the appointment
- I'm plumb (or plum) tuckered out
Noun
- the metal bob of a plumb line
Verb
- adjust with a plumb line so as to make vertical
- examine thoroughly and in great depth
- measure the depth of something