WordWeb Online

1. Cause to allow entrance or exit; allow entry after being shut
   "Mary opened up the car door"
   - open
    
2. Become available
   "an opportunity opened up"
   - open
    
3. Make available
   "This opens up new possibilities"
   - open
    
4. Open up an area or prepare a way
   "She opened up a graduate program for women students"
   - pioneer
    
5. Start to operate or function or cause to start operating or functioning
   "open up a business"
   - open
    
6. Become open
   "The door opened up"
   - open
    
7. Talk freely and without inhibition

Derived forms: opens up, opened up, opening up

See also: open

Type of: afford, arise, change state, come up, give, innovate, introduce, mouth, speak, talk, turn, utter, verbalise [Brit], verbalize, yield

Antonym: close up