Where did the phrase "Firewatch" come from and what does it mean. In the movies, you hear the word fire watch but they never tell what it actually is. Well here is a quick rundown on what firewatch means and where it came from. Military fire watch refers to the responsibility assigned to soldiers to vigilantly monitor designated areas for any signs of fire hazards or outbreaks. This duty involves regular patrols, observation, and immediate action to prevent or extinguish fires, ensuring the safety and security of military installations, equipment, and personnel.