The crossword solution for the term STAY UP is HOVER, which is a five-letter word. To HOVER means to remain in one spot in the air without moving in any direction. This can be done by an aircraft, a helicopter, or even a drone. Hovering is often used when an aircraft needs to STAY in one spot for a long period of time, such as when it is waiting for clearance to land. It can also be used to observe an area from a distance.