put our heads together

(idiom) to work together on something with two or more people

Example Sentences:

I’m not sure how to do this assignment, but if we put our heads together, I think we might be able to figure it out.

Kids: Mom, we don’t want to clean up the house anymore!
Mom: Well, if you keep putting your heads together, it will go faster!

Our presentation was taking a long time, but once we put our heads together, it was much easier.