Usually this call is done by facing couples. The result is four dancers lined up shoulder to shoulder. The dancers who were originally facing take right hands with each other, and the two who stop in the middle take left hands with each other. This kind of formation, with dancers lined up facing in alternating directions, is called a "wave".
The same action can be done from facing lines, with the result being a longer wave.
Note: The most common kind of wave consists of four dancers. A wave consisting of eight dancers is called a "tidal wave". A wave consisting of just two dancers is called a "mini-wave".