out-of-service adjective 1out of service prepositional phrase 1 adjective1 •Not working, not functioning, broken; currently unavailable.No one much likes it when something—an empty cab, an out-of-service subway train, summer—goes by without stopping. — 2005 out of service prepositional phrase1 •Not available for use.This train is going out of service at the next station.The sign that said the elevator was "temporarily out of service" had been there for months.
