I’m my language it’s “bottom up” (ondersteboven).

Also came to a similar realization in my language with “averechts”, which means the other way around.

Rechts = right (side, from my pov)

Averechts = ave ( dialect for “your”) right side.

You’re basically communicating “my right or your right”. Asking for right or left can be done by saying rechts or averechts.

Also besides ondersteboven and averechts, we have achterstevoren, which means back side in front.