The crossword solution for the term 'FLY UP HIGH' is SOAR, which is a four letter word. To SOAR means to fly or glide through the air with little effort, often in a graceful manner. It is typically used to describe the flight of birds, but can also be used to describe the flight of aircraft or other objects. Soaring is a popular recreational activity, and many people enjoy the feeling of freedom that comes with it.