Definition of firemen:
(n) :
(firefighting) Someone (especially one who is male) who is skilled in the work of fighting fire.
(n) :
(rail transport, nautical) A person (originally a man) who keeps the fire going underneath a steam boiler (originally, shoveling coal by hand), particularly on a railroad locomotive or steamship.
(n) :
(rail transport, by extension) An assistant on any locomotive, whether steam-powered or not.
(n) :
(baseball) A relief pitcher (reflecting the figurative analogy of rescuing the situation).
(n) :
(mining, historical) A safety inspector in coal mines.
(n) :
A surname.