Team up is a phrase that is used to describe the act of two or more people, groups, or organizations coming together to work towards a common goal. The crossword solutions for this term include COOPERATE (9 letters), MERGE (5 letters), JOIN (4 letters), ALLY (4 letters), UNITE (5 letters), PARTNER (7 letters), JOIN forces (10 letters), and combine forces (13 letters). All of these words imply the same concept of working together in order to achieve a desired outcome.