1. to work together with others toward a common goal or purpose
2. to be helpful by doing what someone asks or wants

Examples

• The two companies decided to cooperate on the new project.
• Students must cooperate with each other during group activities.
• The witness refused to cooperate with the police investigation.
• If everyone cooperates, we can finish the work by Friday.
• The countries agreed to cooperate in fighting climate change.
• Please cooperate with the security procedures at the airport.
• The children learned to cooperate instead of fighting over toys.