1.
If you describe something as ~, you mean that it has not been seen for a long time.
...a spectacular ballroom, ~ by the public for over 30 years...
We print a selection of previously ~ photos from the Spanish rider’s early years.
ADJ
2.
You can use ~ to describe things which people cannot see.
For me, a performance is in front of a microphone, over the radio, to an ~ audience...
There was barely time for the two boys to escape ~.
ADJ: ADJ n, ADJ after v