Put our/your/their heads together
Definition 1 of 1
Pro Tip 1/3Team Effort
The phrase suggests working closely with others, emphasizing unity and collective intelligence. 
The project was tough, but we put our heads together and succeeded.
Pro Tip 2/3Brainstorming
It often implies a structured group brainstorming session to generate creative solutions. 
Let's put our heads together and brainstorm some ideas for the event.
Pro Tip 3/3Informal Setting
Typically used in less formal, casual situations, such as among friends or coworkers. 
Our team dinner is a great time to put our heads together about the new project.