open up (Verb) — Cause to allow entrance or exit; allow entry after being shut. ex. "Mary opened up the car door"
open up (Verb) — Become available. ex. "an opportunity opened up"
open up (Verb) — Make available. ex. "This opens up new possibilities"
open up (Verb) — Open up an area or prepare a way. ex. "She opened up a graduate program for women students"
open up (Verb) — Start to operate or function or cause to start operating or functioning. ex. "open up a business"
open up (Verb) — Become open. ex. "The door opened up"
open up (Verb) — Talk freely and without inhibition.