Tango NEED is a TWO-word phrase that is often used to describe a situation in which TWO people NEED each other in order to achieve a goal. The first word, 'TANGO, ' is derived from the Argentine dance of the same name, which requires TWO people to work together in perfect harmony. The second word, 'NEED, ' implies that both parties must be involved in order for the desired outcome to be achieved. This phrase is often used to describe relationships between TWO people, such as a romantic relationship or a business partnership. It can also be used to describe situations in which TWO people are working together to accomplish a common goal.