noun (the all-clear) [sing.]
1 if a doctor gives sb the all-clear, they tell the person that he/she does not have any health problems: (figurative) The building was given the all-clear following tests.
2 permission to do sth:
The ship was given the all-clear to sail again.
3 a signal (often a sound) which shows that a place or situation is no longer dangerous:
The children hid in the basement until the all-clear sounded.
