Ini idiom. Tidak bisa kata tango saja yang ditanyakan.

it takes (at least) two to tango = both people involved in a bad situation are responsible for it

English term (edited): it takes two to tango

Inilah pepatah yang paling mendekati it takes two to tango. Kata referensi berikut, asalnya dari China, dan mengenai sengketa. Tetapi, saya rasa itu juga berlaku pada banyak hal. Dokter tidak bisa membedah kalau pasien tidak setuju, penyuapan tidak mungkin kalau cuma ada yang menyuap, main bola bisa menang hanya kalau ada lawan, dst.

Ref: http://www.kaskus.co.id/showthread.php?t=4396827
Orang tidak bisa bertepuk dengan sebelah tangan
(Sengketa tidak akan terjadi tanpa kedua pihak)

Dalam kaitannya dengan 'Shared decision-making in the medical encounter' di rumah sakit, idiom 'it takes at least two to tango' bermakna 'diperlukan kesepakatan oleh sedikitnya dua orang', yaitu sedikitnya antara pasien dan dokter, sebelum memilih dan melakukan tindakan medis.

It means that two people are required in order to do something, or two things have to be in place at the same time to make something take place. It's sometimes employed when something has occurred that one person is unhappy about, and the other one is pointing that the first participated as well, or it wouldn't have happened.

http://answers.yahoo.com/question/index?qid=20080420133453AA...

"it takes two to tango" which also means "it takes two to cooperate" suggests that you can not perform a task without a partner or someone who can be paired with you to hit your goal (yet occasionally with negative connotations).

http://www.italki.com/answers/question/58127.htm