col·lab·o·rate
verb
Collaboration is the process of two or more people or organizations working together to complete a task or achieve a goal.
"he collaborated with a distinguished painter on the designs"
synonyms: cooperate, join (up), join forces, team up, get together, come together, band together, work together, work jointly, participate, unite, combine, merge, link, ally, associate, amalgamate, integrate, form an alliance, pool resources, club together