bang (people's) heads together

bang (people's) heads together

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

bang (or knock) people's heads together

reprimand people severely, especially in an attempt to stop them arguing.
1998 Community Care There are few signs yet that the SEU has been willing to bang government heads together over social security policy.
See also: bang, head, together