plug·​man | \ˈpləgmən\
plural plugmen

Definition of plugman 

1 : the member of a gun crew (as in the U.S. Navy) whose duty is to open and close the breech plug or breechblock in firing

2 : a miner who attends pumps in a mine

3 : a plugger who fastens stoppers in bottoms of billet molds in which copper is to be cast

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