Noun: all clear ol kleer
- Permission to proceed because obstacles have been removed
"After the bomb threat was investigated, the police gave the all clear"
- A signal (usually a siren) that danger is over
"The all clear sounded, allowing people to leave the bomb shelters"
Derived forms: all clears
Type of: permission, sign, signal, signaling [N. Amer], signalling [Brit, Cdn]
Encyclopedia: All clear