Longman Dictionary of Contemporary English
fire hydrant
noun
EXAMPLES FROM CORPUS
▪ At the same time I started approvals to move a fire hydrant, which is even more critical.
▪ Enter the hardware shop and buy the wrench, exit and walk over to the fire hydrant.
▪ Ideas flowed out of me like water out of a Brooklyn fire hydrant in the midst of a summer heat wave.
▪ In 1906, a fire hydrant saved the city.
▪ It was as if a fire hydrant burst directly upon a group of thirsty street urchins.
▪ She was built like a fire hydrant.
▪ The water poured from the sky as though a fire hydrant had been opened.
The Collaborative International Dictionary
fire hydrant
fire hydrant \fire hydrant\ n. an upright hydrant that can supply large volumes of water to use in fighting a fire. They are commonly placed at intervals at the street edge of a sidewalk, spaced for convenience in suppressing fires in towns.
Syn: fireplug, plug.
Wiktionary
fire hydrant
n. (context firefighting English) A device used by firefighters to obtain water from the main supply, consisting of a barrel, connections for hose and a valve assembly.
WordNet
Wikipedia
Fire hydrant