bn:00002798n
Noun Concept
Categories: Civil defense, Emergency population warning systems, Articles with empty listen template, Military history stubs
EN
all clear
EN
A signal (usually a siren) that danger is over WordNet 3.0
Definitions
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EN
A signal (usually a siren) that danger is over WordNet 3.0 & Open English WordNet
All clear is the signal, generally given by a 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. Wikipedia
A signal given by an air raid siren to indicate that a threat has passed Wikipedia Disambiguation
Signal given by an air raid siren to indicate that a threat has passed Wikidata
A signal that danger, such as an air raid, is over; usually a siren at a single pitch. Wiktionary
IS A
WordNet 3.0 & Open English WordNet
Wikipedia
Wikidata
Wiktionary