Definitions of fireman:

• noun:   play in which children take the roles of firemen and pretend to put out a fire
• noun:   a member of a fire department who tries to extinguish fires
• noun:   a laborer who tends fires (as on a coal-fired train or steamship)
• noun:   a pitcher who does not start the game
• name:  A surname (very rare: popularity rank in the U.S.: #43815)