Gunfire refers to the loud noise made by shooting guns.
When there's gunfire going on, it's often because something bad or serious is happening. You might hear about it on the news when a police officer has an emergency situation and they need backup with their gun. Firefighters are trained to handle situations involving gunfire, but you won't usually see them armed themselves unless they're in extreme danger. Gunfire can also happen during accidents, like people shooting at each other on purpose or by accident while hunting.
How common is "gunfire"?
Word gunfire is considered uncommon in modern English. It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions
noun
Shots from a gun or guns, typically creating loud report.
Example: Let's hide in the trees to avoid the gunfire.
(chiefly military) The use of gunpowder-type weapons, mainly cannon, as opposed to swords or bayonets.
Example: Killing people became much easier and faster once armies started using gunfire.
(military) The time of firing of the morning gun or the evening gun.
(military slang) Tea, a cup of tea, especially one served early in the morning before first parade.
Example: They had only in them the rolled mattresses, the neatly piled bed-boards and the empty tea-buckets of the orderly-men, empied of their last gun-fire.