plumbing (Noun) — Utility consisting of the pipes and fixtures for the distribution of water or gas in a building and for the disposal of sewage.
plumbing (Noun) — The occupation of a plumber (installing and repairing pipes and fixtures for water, gas or sewage in a building).
plumbing (Noun) — Measuring the depths of the oceans.
plumbing (Verb) — Measure the depth of something.
plumbing (Verb) — Weight with lead.
plumbing (Verb) — Examine thoroughly and in great depth.
plumbing (Verb) — Adjust with a plumb line so as to make vertical.