keep one's eyes open informal
keep one's eyes peeled
keep one's eyes skinned

And to keep one's eyes open; when the man closed his, he walked into a tree.

Chapter 22 There's a point after which one cannot possibly continue doing complicated things like thinking and keeping one's eyes open.

For someone in late middle age, I've come to believe, such change can be vital in keeping one's eyes open to the world.

From trying to gather as much information as possible to keeping one's eyes open during the social programme, everything is important.

They're reminders of the value of keeping one's eyes open.

Jesus, life has its share of honorable thrills if one but keeps one's eyes open!

One cannot keep one's eyes open very long without winking, but the stranger never winked at all.

Lessons in the virtues of keeping one's eyes open, they blend seamlessly among the heavyweights always hanging around the walls.

Instead, Mr. Buechner said, it means keeping one's eyes open for "the elusive presence of the holiness of God."

Keeping one's eyes open, occasionally falling in astonishment into a creek or a gutter, obliges one to recall that adventure happens in small places as well as large.

He was driving his horse at a full gallop, down an unknown road, in pitch dark, into a rain coming down so heavily it was impossible even to keep one's eyes open for more than a few seconds at a time.