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