The term "foul ball" is often used in baseball to refer to a ball that is hit outside of the field of play, or if it is caught outside of fair territory. There are several synonyms that can be used to describe this type of situation, including "foul tip," "foul fly," and "foul out." A "foul tip" is when a batter barely makes contact with the ball, sending it directly back to the catcher's mitt. A "foul fly" occurs when the ball is hit high into the air, but is caught by a fielder outside of fair territory. Finally, a "foul out" is when a batter hits a ball that is caught by a fielder in foul territory, resulting in an out.