knock heads together—get people to stop quarrelling and behave sensibly by taking firm action:
- An elected mayor is empowered to knock heads together and persuade people who traditionally don’t talk to each other to do so.
put heads together —(also: lay heads together) have a discussion in order to solve a problem, etc.:
- The present plans are far too expensive. I think we should put our heads together and see if we can somehow make them cheaper.
Note: The expression does not correlate in meaning with the phrase get one’s head together—(coll.) get mentally organized; start to perform efficiently (also: get one’s act together):
- It has taken me over ten years to get my head together enough to put this down in writing, but I have carried it in my heart.