To compartmentalize means to be able to take all the mental baggage of an issue, put it into a room or compartment in your mind, and then close the door so that you can focus upon another issue. This is similar to juggling, but it differs in that usually the issues which need to be compartmentalized have the potential of completely de-railing your entire focus, and negatively affecting your life.

For more on this check out the short video below: