Hit (a ball) high is a phrase used in many sports, such as baseball, golf, and tennis. It refers to the act of hitting the ball with a lot of force and sending it high into the air. The crossword solutions for this term are SKY (3 letters) and LOFT (4 letters). SKY is an appropriate solution because when you hit a ball high, it goes up into the SKY. LOFT is also an appropriate solution because when you hit a ball high, you are essentially lofting it into the air.