<p><strong>Noun</strong></p><ul><li>a person who installs and repairs piping, fixtures, appliances, and appurtenances in connection with the water supply, drainage systems, etc., both in and out of buildings.</li><li>Slang. an undercover operative or spy hired to detect or stop leaks of news or secret information, often using questionable or illegal methods, as illegal entry or wiretapping.</li><li>Obsolete. a worker in lead or similar metals.</li></ul>