What does the expression 'It takes two to tango' mean?

The expression 'It takes two to tango' is an idiomatic phrase that means that both parties involved in a situation are responsible for the outcome. It suggests that a situation or conflict cannot occur unless both parties are willing to participate in it. It's often used to emphasize that it's not just one person's fault, but rather both parties need to take responsibility and work together to resolve the issue.

The phrase originated in the United States in the 20th century and was popularized by the song 'Takes Two to Tango,' which was released in 1952. The song uses the dance as a metaphor for a relationship, emphasizing that both partners need to be willing to participate in the dance for it to work.

Some common examples of when this expression can be used include negotiations, arguments, and relationship issues. It's a reminder that it's not enough for just one person to be willing to compromise or work things out, both parties need to be on board for a successful resolution.