An all-clear is a term used by
civil defenseor military authorities to inform others that an imminent physical danger has passed. This typically will end an alertor warningstatus that was previously issued. The all-clear can be given vocally, through media — such as televisionor radio, or via means of civil defense broadcast systems such as air raid and tornado sirens.
The term gained notoriety during
World War Iwhen deadly chemical agentswere deployed on the battlefield— the all-clear would be given once the area was free of contamination. Since this time, the all-clear has been used to notify that conventional, nuclear, biological, chemical, or environmental threats are no longer of immediate concern.
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all clear — n all clear the all clear a) official permission to begin doing something give (sb)/get the all clear ▪ We ve got the all clear for the new project. b) a signal such as a loud whistle that tells you that a dangerous situation has ended … Dictionary of contemporary English
all-clear — allˈ clearˈ noun A signal that the reason for sheltering, or (figurative) for inactivity, is past • • • Main Entry: ↑all … Useful english dictionary
all-clear — [ôl′klir′] n. a siren blast or other signal that an air raid or practice alert is over * * * … Universalium
all clear — all′ clear′ n. the signal that a danger is over • Etymology: 1915–20 … From formal English to slang
all-clear — ► NOUN ▪ a signal that danger or difficulty is over … English terms dictionary
all-clear — [ôl′klir′] n. a siren blast or other signal that an air raid or practice alert is over … English World dictionary
all clear — 1) N SING: the N 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. CONVENTION All clear is also a convention. All clear, Misha growled.… … English dictionary
all clear — noun the all clear a) official permission to begin doing something: We ve got the all clear from the board for the new project. b) a signal such as a loud whistle that tells you that a dangerous situation has ended: give/sound the all clear: The… … Longman dictionary of contemporary English
all clear — If you are allowed to do something after a check up to make sure that everything is all right, you get the all clear. Dad says he s going to play golf again as soon as he gets the all clear from his doctor … English Idioms & idiomatic expressions
all clear — Synonyms and related words: Klaxon, Mayday, SOS, above water, air raid alarm, alarm, alarm bell, alarm clock, alarm signal, alarum, alert, all straight, beacon, blinking light, burglar alarm, buzzer, clear, crostarie, fiery cross, fire alarm,… … Moby Thesaurus