It takes two to tango
Definition 1 of 1
Pro Tip 1/3Shared Responsibility
This phrase emphasizes that both parties have contributed to a situation, not just one. 
When the project failed, the team understood it takes two to tango.
Pro Tip 2/3Reflective Accusation
Used to suggest that someone should not blame others without acknowledging their own role. 
Don't point fingers – it takes two to tango, after all.
Pro Tip 3/3Conflict Resolution
Helpful in defusing arguments by reminding those involved that they both have a part in the conflict. 
To settle their dispute, they admitted it takes two to tango.