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  1. In a cross shape; a term used to describe a movement that is done to the front, side, back and again side.
  2. ["in (the form of) a cross"]. Usually applied to exercises at the barre: the exercise is done first with the working leg moving to the front, then to the side, then to the back, and then to the (same) side again. Source: Vance's Fantastic - BALLET DICTIONARY