"plumb" in the noun sense

1. plumb bob, plumb, plummet

the metal bob of a plumb line

"plumb" in the verb sense

1. plumb

measure the depth of something

2. plumb

weight with lead

3. plumb

examine thoroughly and in great depth

4. plumb

adjust with a plumb line so as to make vertical

"plumb" in the adjective sense

1. plumb

exactly vertical

"the tower of Pisa is far out of plumb"

"plumb" in the adverb sense

1. clean, plumb, plum

completely used as intensifiers

"clean forgot the appointment"

"I'm plumb (or plum) tuckered out"

2. plumb

conforming to the direction of a plumb line

3. plumb, plum

exactly

"fell plumb in the middle of the puddle"

Source: WordNet® (An amazing lexical database of English)

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