A horn on a fire alarm that sounds in case of fire, either automatically when the system detects fire or manually when the alarm is pulled, to alert the occupants of a building or complex of the hazard.

A warning of an imminent explosion in a confined space, especially a grenade or blasting charge. / (slang) A generalized warning that something is about to happen.

Alternative form of fire dog

(informal) High-proof alcohol, especially whiskey (especially in the context of its sale to or consumption by Native Americans).

(firearms) To discharge a weapon without ammunition in the chamber. / (archery) To draw and release a bow without an arrow loaded.

(Scotland) The practice, during Hogmanay, of visiting friends and family, especially to be the first person to cross a home's threshold after midnight on New Year's Eve bearing a small gift.

A small, controlled fire set in the path of a larger uncontrolled fire, in order to limit the spread of the large fire by removing its fuel.

The first produce or result, notably firstborn offspring. / The first of a class or kind. / The thing first thought or done.

Firstborn.

A harbor boat designed for pumping large volumes of harbor water onto dockside fires.