collaborate [collaborated, collaborating, collaborates](to work together on a piece of work) verb [UK: kə.ˈlæ.bə.reɪt] [US: kə.ˈlæ.bə.ˌret]He collaborated with the enemy. = Ha collaborato col nemico.
concert(to act in harmony or conjunction) verb [UK: kən.ˈsɜːt] [US: ˈkɑːn.sərt]
cooperate [cooperated, cooperating, cooperates](to work together) verb [UK: kəʊ.ˈɒ.pə.reɪt] [US: koʊ.ˈɒ.pə.reɪt]John and Mary are cooperating. = John e Mary stanno collaborando.