all clear
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all clear
n.
A signal, usually by siren, that an air raid is over or a danger has passed.
all clear
n
1. (Military) a signal, usually a siren, indicating that some danger, such as an air raid, is over
2. an indication that obstacles are no longer present; permission to proceed: he received the all clear on the plan.
all′ clear′
n.
the signal that a danger is over.
[1915–20]
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Noun | 1. | all clear - a signal (usually a siren) that danger is over |
2. | ![]() permission - approval to do something; "he asked permission to leave" |