Back the other side (7)
I believe the answer is:
reverse
I believe this is a double definition.
'back' is the first definition.
(thesaurus)
'the other side' is the second definition.
(thesaurus)
(Other definitions for reverse that I've seen before include "come back" , "Transpose" , "Severer (anag.)" , "Turn inside out or upside down" , "Rescind (decision)" .)