Open up, spread out (6)
I believe the answer is:
unfold
I believe this is a double definition.
'open up' is the first definition.
(thesaurus)
'spread out' is the second definition.
(synonyms)
(Other definitions for unfold that I've seen before include "Tell" , "Spread out or become visible" , "Open out - develop" , "'O clouds, - - !' (Blake)" , "Spread out or become known" .)