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Noun: all clear  ol kleer
  1. A signal (usually a siren) that danger is over
     
  2. Permission to proceed because obstacles have been removed

Derived forms: all clears

Type of: permission, sign, signal, signaling [N. Amer], signalling [Brit, Cdn]

Encyclopedia: All clear

Nearest

alkylbenzenesulfonate
alkylic
alkyne
all
all along
all and sundry
all around
all arounder
all at once
all but
all clear
all day long
all ears
all fired up
All Fools' day
all fours
all get out
all important
all in
all in all
all in one go