Antonyms for the word "team up" include "separate," "compete," "isolate," and "individualize." When individuals are separated, it means that they are working independently without collaborating or working alongside each other. Competing indicates the presence of rivalry between different groups or individuals. Isolation depicts a sense of detachment and a lack of connection between parties. Individualizing refers to placing emphasis on personal strengths and abilities, rather than working together with a team to achieve a common goal. While teamwork is often a cornerstone of success, there are situations where going solo or competing may be necessary.