[Callers] Why is it a half-sashay?

Would someone please explain why moving your right foot out to your right and following it by moving your body and left foot is only half a sashay? Seems like a full sashay to me. Half a sashay would be like, taking a wide stance and stopping. In ballet, a chasse' is walking by moving one foot out and following it up with the other, never crossing them. Based on some limited reading, I don't think it's counted (as in, chasse' three times), but rather refers to the style of walking, say as opposed to jogging. I could be mistaken. "Roll away with a half sashay!" sure rolls off the tongue nicely, though... --jh--