play in which children pretend to put out a fire
"The kids spent their recess playing fireman, racing each other to save the toy cat from the burning pillow fort."
a pitcher who does not start the game
"The manager decided to pinch-hit instead of bringing in his usual fireman to face the opposing closer."
a member of a fire department who tries to extinguish fires
"The brave fireman rushed into the burning building to save the trapped cat."
Someone (especially one who is male) who is skilled in the work of fighting fire.
"The veteran fireman quickly assessed the burning warehouse and directed his team to cut a path through the flames."