all clear
noun
the signal that an air raid or other danger is over.
Origin of all clear
First recorded in 1915–20
Words nearby all clear
all at once,
all at sea,
all better,
all blacks,
all but,
all clear,
all cylinders,
all ears,
all else being equal,
all eyes,
all fools' day
British Dictionary definitions for all clear
all clear
noun
a signal, usually a siren, indicating that some danger, such as an air raid, is over
an indication that obstacles are no longer present; permission to proceed
he received the all clear on the plan