1.
The all clear is a signal that a dangerous situation, for example an air raid, has ended.
The all clear was sounded about 10 minutes after the alert was given.
N-SING : the N
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All clear is also a convention.
‘All clear,’ Misha growled.
CONVENTION
2.
If someone in authority gives you the all clear , they give you permission to continue with a plan or activity, usually after a problem has been sorted out.
I was given the all clear by the doctor to resume playing.
= go-ahead
N-SING : the N