"It takes two to tango" means that two people in a fight are both responsible for that fight. Example: "He hit me first; it wasn't my fault!" Answer: "It takes two to tango." Just like a dance between two lovers (the tango); one person might start the fight, but they both keep it going; it takes two [people] to [dance the] tango. Example: "Her husband is awful; they fight all the time." Answer: "It takes two to tango." A conflict is not the fault of just one person or the other; they are often both to blame, because it takes two to tango.