Meaning: air alert 
n.
the time period during which military and civilian agencies are prepared for an enemy air attack
the condition in which combat aircraft are airborne and ready for an operation
the warning signal that begins an period of preparation for an enemy air attack
be on red alert Idiom, Proverb
alert to
We must alert the people to the dangers facing our country．我们必须提醒人民注意国家所面临的危险。
We must alert them to the need to solve these problems．我们必须提醒他们有必要解决这些问题。
on the alert
Drivers must be on the alert for traffic signals．汽车驾驶员必须注意交通信号。
on the alert for
Idiom(s): on the alert (for sb or sth)Theme: ALERTNESS
watchful and attentive for someone or something.
• Be on the alert for pickpockets.
• You should be on the alert when you cross the street in heavy traffic.
on the alert|alert|on
adj. phr. Alert; watchful; careful. Campers must be on the alert for poison ivy and poison oak. Drivers must be on the alert for traffic signals.Compare: ON ONE'S TOES.
alert
alertsee on the alert.
be on red alert
To be actual active and accessible to booty action. This appellation is generally activated to soldiers. We're safe here—the soldiers patrolling the bound are on red alert. As anon as I heard my window breach in the average of the night, I was on red active to action off an intruder.Learn more: alert, on, red
Dictionary
More Idioms/Phrases
aim air alarm alarum albatross around one's neck aleck alert alive all along the line be on another planet be on at be on at someone be on automatic pilot be on bad terms (with someone) be on cloud nine be on course for be on edge be on everyone's lips be on firm ground be on friendly terms with (someone) be on full alert be on game be on good terms (with someone) be on good, bad, friendly, etc. terms be on guard be on hand be on ice be on in years be on its last legs be on nodding terms be on nodding terms (with someone) be on nodding terms with somebody be on pins and needles be on Queer Street be on red alert be on relief be on show be on some other shit be on somebody's back be on somebody's case be on somebody's side be on someone's back be on someone's case be on someone's head be on someone's shoulder be on song be on speaking terms be on stream be on the (something) side be on the anvil be on the back burner be on the back foot be on the ball be on the blink be on the breadline be on the brink of (doing something) be on the bum be on the cards be on the carpet be on the case
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Dictionary of similar words, Different wording, Synonyms, Idioms for Idiom, Proverb be on red alert
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