Reverse

1. Opposite, contrary; going in the opposite direction. [from 14th c.]
2. The mirror showed us a reverse view of the scene.
3. Pertaining to engines, vehicle movement etc. moving in a direction opposite to the usual direction. [from 19th c.]
4. (rail transport, of points) To be in the non-default position; to be set for the lesser-used route.
5. Turned upside down; greatly disturbed.
6. (botany) Reversed.
7. (genetics) In which cDNA synthetization is obtained from an RNA template.

(rail transport): normal

      ADVERB

(now rare) In a reverse way or direction; upside-down. [from 16thc. (from the 14thc. in Middle English)]

vice versa or upside down