Used when you want to stop an argument and encourage cooperation or agreement. The kids wouldn't share their toys, so I had to knock their heads together.
Pro Tip 2/3
Leadership Action
Shows the need for a leader or someone in charge to intervene in a dispute. As the manager, it's my job to bang their heads together to meet the deadline.
Pro Tip 3/3
Not Literal
It's a metaphorical expression and doesn’t involve physical contact. When the team argued, the coach didn't literally bang their heads together.