open up

cause to open or to become open

• “Mary opened the car door”

become available

• “an opportunity opened up”

make available

• “This opens up new possibilities”

open up an area or prepare a way

• “She pioneered a graduate program for women students”

start to operate or function or cause to start operating or functioning

• “open a business”

become open

• “The door opened”

talk freely and without inhibition