Definitions from Wiktionary (plumb)

▸ noun:  A little mass of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction.
▸ noun:  (nautical) A weight on the end of a long line, used by sailors to determine the depth of water.
▸ noun:  The perpendicular direction or position.
▸ adjective:  Truly vertical, as indicated by a plumb line.
▸ adjective:  (cricket) Describing an LBW where the batsman is hit on the pads directly in front of their wicket and should be given out.
▸ adverb:  In a vertical direction; perpendicularly.
▸ adverb:  (informal) Squarely, directly; deeply, completely.
▸ verb:  To determine the depth, generally of a liquid; to sound.
▸ verb:  To attach to a water supply and drain.
▸ verb:  (transitive, figurative) To think about or explore in depth, to get to the bottom of, especially to plumb the depths of.
▸ verb:  To use a plumb bob as a measuring or aligning tool.
▸ verb:  To accurately align vertically or horizontally.
▸ verb:  (dated) To seal something with lead.
▸ verb:  (intransitive) To work as a plumber.
▸ verb:  (rare) To fall or sink like a plummet.
▸ verb:  (US, colloquial, figuratively, obsolete) To trace a road or track; to follow it to its end.
▸ verb:  (nautical) To position vertically above or below.
▸ noun:  A surname.
▸ noun:  Obsolete form of plum (“the fruit”). [The fruit and its tree.]

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