Every policeman stood a little more alert, looked at the kids with a whole new expression.

We see two wolves standing alert by a river.

That done, he stood alert, his own gun ready.

"Contingency plans have indeed been drawn up by members of my staff, and our forces are already standing alert."

Standing alert in the drizzle were a dozen of his gang.

The force field glowed across the front of his cell, and two armed guards stood alert before it.

On every side, black-liveried troops stood alert for any dissent.

Then he turned and looked at the stallion, who stood alert, his handsome head high.

They were standing alert within hours of their arrival.

The guards stood alert and tense in the shadow of the trees.