The phrase "cooperative effort" means working together as a group towards a common goal. It involves people joining forces and sharing their skills, ideas, and resources to achieve something collectively. Full definition
The climate challenge can not be resolved without the concerted, cooperative efforts of these two nations. (climatecommunication.org)
There has also been cooperative efforts between many state and local animal welfare organizations. (labrescuect.org)
That quick work was part of a larger cooperative effort with the local public - housing authority, which district leaders credit for a drop in student - mobility rates. (leaders.edweek.org)