with one’s eyes wide open—
1. stare in amazement or wonder:
- He just stared and stared with his eyes wide open. So much so, he kept missing his mouth with his spoon.
2. do smth. fully aware of the consequences:
- He knows what he is doing and he is doing it with his eyes wide open.
with wide-open eyes— = with one’s eyes wide open 1:
- I saw him stare at me with wide-open eyes as I walked slowly up to him holding out my revolver.