pack-line defense
A man-to-man defensive system in which one player pressures the ball and the other four "pack" down within an imaginary "line" extending to about 2 feet (60 cm) inside the three-point arc, with the intent of preventing dribble penetration. The system, derived from a number of other man-to-man systems, was developed by Dick Bennett, and has been popularized in the 21st century by coaches including his son Tony, Chris Mack, and Sean Miller