'open up' definitions:

Definition of 'open up'

From: WordNet
verb
Cause to open or to become open; "Mary opened the car door" [syn: open, open up] [ant: close, shut]
verb
Become available; "an opportunity opened up" [syn: open, open up]
verb
Make available; "This opens up new possibilities" [syn: open, open up]
verb
Open up an area or prepare a way; "She pioneered a graduate program for women students" [syn: pioneer, open up]
verb
Start to operate or function or cause to start operating or functioning; "open a business" [syn: open, open up] [ant: close, close down, close up, fold, shut down]
verb
Become open; "The door opened" [syn: open, open up] [ant: close, shut]
verb
Talk freely and without inhibition [ant: be quiet, belt up, button up, clam up, close up, dummy up, keep mum, shut up]

Synonyms of 'open up'

From: Moby Thesaurus