from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a signal (usually a siren) that danger is over
  • n. permission to proceed because obstacles have been removed


all + clear (Wiktionary)


  • It is not at all clear whether this luxurious situation is designed to entice the wealthy or encourage the dispossessed or, as some irreverent voices in Society whispered, to provide the Countess of Sawley with an inexpensive pied -- terre in the West End of London.

    A Murder of Quality

  • Patrizio and Anna had sussed out the entire Colosseum at four a.m., reporting all clear in whispers.

    The Vatican Rip

  • That smile made it all clear as spring water, if Kalyan's eyes had not.

    The Path of Daggers

  • “No. You will not try, you will do’t Are we all clear on this here?”

    Wit'ch Storm

  • How the talk got that way I canna think; but he had out a reflector lantern and a globe, and made it all clear in a minute.


  • But it wasnt at all clear that seeing this job primarily as staffing the president rather than managing the policymaking process was what this president neededeven though, by all evidence, it was what he wanted.

    In the Shadow of the Oval Office

  • When she left the Peavys’ farm with the quilt pattern in her pocket, the sun had just slipped below the horizon and the sky was all clear and softly green like glass.

    Caddie Woodlawn’s Family

  • I have shown,10 at least to my own satisfaction, that the conception of sexuality is not at all clear to any of the Freudian school, including Freud himself.

    The Journal of Abnormal Psychology


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