Red Alert
WordNet
noun
(1) The highest level of alert when an attack by the enemy seems immanent (or more generally a state of alert resulting from immanent danger)
WiktionaryText
Interjection
red alert
- a warning that indicates an emergency situation
- a state of readiness to deal with such emergency situation
Synonyms
- battle stations
- general quarters (US Navy)
- action stations (UK Navy)