This article outlines a defensive concept for ultimate frisbee called "Cup". It explains how the Cup is a static defensive formation that puts four defenders in a diamond shape around the offensive player. The goal is to cover all possible throwing options and force the player to make a difficult pass or turn the disc over. The article goes on to discuss various scenarios in which the Cup can be used to stop the offense from progressing down the field. It also points out that the Cup is often used as the last line of defense, so it is important for the team to be able to transition quickly out of it.