Source : WordNet®

open up
     v 1: cause to open or to become open; "Mary opened the car door"
          [syn: {open}] [ant: {close}]
     2: become available; "an opportunity opened up" [syn: {open}]
     3: make available; "This opens up new possibilities" [syn: {open}]
     4: open up an area or prepare a way; "She pioneered a graduate
        program for women students" [syn: {pioneer}]
     5: start to operate or function or cause to start operating or
        functioning; "open a business" [syn: {open}] [ant: {close}]
     6: become open; "The door opened" [syn: {open}] [ant: {close}]
     7: talk freely and without inhibition [ant: {close up}]