We're back in the red because sales are way down this quarter.
State government has been operating in the red for five straight years.
on red alert: ready to deal with an emergency 处于紧急戒备状态
As soon as I heard my window break in the middle of the night, I was on red alert to fight off an intruder.
The soldiers patrolling the border are on red alert.
see red: become very angry 发怒，大怒
Bill really saw red when the tax bill arrived.
When she hung up the phone, I saw red. I’ve never been so angry in my life.
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