plumb - noun

the metal bob of a plumb line

plumb - verb

• measure the depth of something
• weight with lead
• examine thoroughly and in great depth
• adjust with a plumb line so as to make vertical

plumb - adjective

• exactly vertical

plumb - adverb

• completely; used as intensifiers
• conforming to the direction of a plumb line
• exactly

plumb - thesaurus

clean   plum   plummet