up I .
open sth up | ˌopen ˈup
1.
to become or make sth possible, available or able to be reached :
The railway opened up the east of the country.
Exciting possibilities were opening up for her in the new job.
2.
to begin business for the day; to start a new business :
I open up the store for the day at around 8.30.
OPP close up
3.
to start a new business :
There's a new Thai restaurant opening up in town.
OPP close down
4.
to develop or start to happen or exist; to develop or start sth :
A division has opened up between the two ministers over the issue.
Scott opened up a 3-point lead in the first game.
5.
to appear and become wider; to make sth wider when it is narrow or closed :
The wound opened up and started bleeding.
The operation will open up the blocked passages around his heart.
OPP close up
II .
to make sth open that is shut, locked, etc. :
She laid the book flat and opened it up.