I teach partner dancing. I want to use language that makes sense to both Leads and Follows. When partners are facing each other, moving together, "Side!" is usefully ambiguous, meaning (depending on context) "right" to the Leads and "left" to Follows. In the same way, I want a word which can mean either "Forward" or "Backward". I can't find a word in English. Is there such a word in any language?
(Yes, the ambiguity of "Side!" could be confusing, but if it's clear that one foot is free and the other is not, without doing extra-fancy manoeuvres "Side!" can only mean one direction to each dancer, and when partners are facing each other, one will move left and the other right, and that will be the same direction.)
Edit: If not from another language, is there a useful term from science or some other discipline?