nadole

1. down; downward
   Pogledala je nadole i videla ključeve. — She looked down and saw the keys.
   Cene su krenule nadole. — Prices started going down.
2. (od + gen.) and below; and under
   Deca od šest godina nadole ulaze besplatno. — Children aged six and under get in for free.

Nadole marks direction, while dole can mark location or direction: ide nadole / ide dole; on je dole.