What is the meaning of Fireman?

Someone (especially one who is male) who is skilled in the work of fighting fire.

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.

An assistant on any locomotive, whether steam-powered or not.

A relief pitcher (reflecting the figurative analogy of rescuing the situation).

Source: wiktionary.org

See also