Definition of open up
1
: to make available or possible
- The discovery opens up the possibility of new cures.
2
: to make plain or visible : disclose
3
: to open by cutting into
1
: to become available or possible
- The hostess will let us know when a table opens up.
2
: to spread out or come into view
- The road opens up ahead.
3
: to commence firing
4
: to become communicative
- tried to get the patient to open up
