all-clear

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(ôl′klir′)

noun

a siren blast or other signal that an air raid or practice alert is over

See all-clear in American Heritage Dictionary 4

noun
A signal, usually by siren, that an air raid is over or a danger has passed.

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© 1996-2013 LoveToKnow, Corp. All Rights Reserved. Audio pronunciation provided by LoveToKnow, Corp.