The crossword solution for the term (OF AN ENGINE) RAN OUT OF GEAR is IDLED, which is a 5-letter word. Idling is the process of running an engine without engaging the transmission, allowing the engine to run without moving the vehicle. This is often done when a vehicle is stopped at a traffic light or in a parking lot. When an engine runs out of gear, it is no longer able to move the vehicle forward and must be IDLED until the driver can shift into a higher gear.