bang/knock your/their heads together

knock your/their/our heads together

To scold two or more people harshly. If you two do something this stupid again, I'm going to knock your heads together!
See also: head, knock, together

bang/knock your/their ˈheads together

(informal) force people to stop arguing and behave in a sensible way: I’d like to bang those stupid politicians’ heads together.
See also: bang, head, knock, together