be on red alert

To be very attentive and ready to take action. This term is often applied to soldiers. We're safe here—the soldiers patrolling the border are on red alert. As soon as I heard my window break in the middle of the night, I was on red alert to fight off an intruder.

Common Names:

Name	Pronounced	Usage
Widukind	-	Ancient Germanic
&Aelig;Thelric	-	Anglo-Saxon (Latinized)
Brutus	-	Ancient Roman
Helle (2)	-	Greek Mythology
Ayyub	-	Arabic
Tehila	-	Hebrew