Wiktionary
team up
vb. (context idiomatic English) To join into a team, or into teams.
WordNet
team up
v. form a team; "We teamed up for this new project" [syn: team]
Usage examples of "team up".
What good would it do to bring the traverse team up here if there is no physician here to treat them?
He could either try to team up with Hunter and almost certainly lose MC 2 to him permanently, or he could enlist Captain Tomann's help.
And as harsh as it was, there was no reason for Tirdal to team up with a crippled human, and every reason to split Dagger's attention.