![red alert red alert](https://www.tekportal.net/wp-content/uploads/2018/12/red-alert.png)
noun
- (in military or civilian defense) the most urgent form of alert, signaling that an enemy attack is believed to be imminent.
- the signal or alarm sounded for this alert.Compare blue alert, white alert, yellow alert.
- a signal or warning that a critical situation is developing or has occurred.
- the period during which a state of crisis or danger is declared to exist.