Definition
This idiom is used to emphasize that both parties involved in a challenging situation share the responsibility for it, or that an activity requires the willing participation of two people.
The breakdown of the marriage wasn't one-sided; it takes two to tango.
I know he made a mistake, but it takes two to tango, and you shouldn't have continued to fuel the argument at the time.
Their conflict wasn't a one-sided issue; it takes two to tango.