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What is "all clear"

Crossword clues for all clear

all clear
Longman Dictionary of Contemporary English
all clear
noun
EXAMPLES FROM CORPUS
▪ But at the time, of course, this was not at all clear.
▪ But it was not at all clear that Clinton could win the election.
▪ Indeed, it was not at all clear that Eisenhower and Khrushchev could control the hardliners in their own countries.
▪ It is not at all clear that physical distances or times can realistically be said to have this property.
▪ It is not at all clear that such absurdly tiny scales have any physical meaning whatever.
▪ What is not at all clear, however, is the way one should adjudicate the differences.
▪ Which is correct is not at all clear.
Wiktionary
all clear

n. 1 a signal that danger, such as an air raid, is over; usually a siren at a single pitch 2 permission to proceed after obstacles have been removed

WordNet
all clear

  1. n. a signal (usually a siren) that danger is over

  2. permission to proceed because obstacles have been removed

Wikipedia
All clear

All clear is the signal, generally given by an civil defence siren, which indicates that an air raid or other hazard has finished and that it is safe for civilians to leave their shelters.

During the First World War, the Metropolitan Police introduced their first air raid warning system in London in 1917, which consisted of police officers detonating maroons (a type of loud firework) and the "all clear" was sounded by Boy Scout buglers.

Immediately before the Second World War, a network of sirens had been established in towns across the United Kingdom; the "alert" was given given by a rising and falling tone and the "all clear" by a continuous tone.

All Clear (disambiguation)

All Clear may also refer to:

  • Blackout/All Clear, a science fiction novel by Connie Willis
  • Operation All Clear, a military operation conducted by Royal Bhutan Army forces
  • Operation All Clear (Manipur), a military operation conducted by Indian Army forces against Manipur insurgents
  • "All clear" is a signal given by an air raid siren to indicate that the current threat has passed.

Usage examples of "all clear".

Her fine lines, the lofty rake of her masts, the wide spread of her yards, were all clear indications of speed, for which some sacrifice of cargo-carrying capacity had been made.

Plenty of cover for anyone wanting to ambush them, but the sensors showed all clear.

The cluttered room behind him, his own reflection, Carlin's half-turned figure -- they were all clear, sharp, almost three-dimensional.