Definition of the all-clear noun from the Oxford Advanced American Dictionary

     

    the all-clear

     noun
    noun
     
    [singular]
     
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  1. 1a signal (often a sound) that shows that a place or situation is not dangerous anymore The children hid in the basement until the all-clear sounded.
  2. 2if a doctor gives someone the all-clear, they tell the person that they do not have any health problems (figurative) The building was given the all-clear following tests.
  3. 3permission to do something The ship was given the all-clear to sail.
See the Oxford Advanced Learner's Dictionary entry: the all-clear