He kept his eyes open for any other sign of life.
We have been waiting for a sign, one way or the other.
His only plan was to wait for a sign from God.
I made myself go near it and look for some sign of life.
They could have been simply following the police's lead, but I took it for a good sign.
She looked for a sign, and finally saw it above her eye level.
He was looking for a sign, however small, of human life.
He looked for a sign of the man but could pick nothing out in the dark.
He watched her face for any sign of what she might be thinking.
She looked for any sign of fear in his eyes, but saw none.