He dare not even leave these two deceased to the last, for fear the trail might grow cold.

The trail to these assets "has grown cold," the report adds.

No, if she did that, the trail would grow cold.

The trail grew worse; in some spots it became almost vertical.

"After Saipan, the trail grows cold until late in the war," the author says.

There the trail grows cold, as to date nothing further is known of his life.

But the trail grew faint almost as soon as it began.

He had a point, but the trail was growing colder by the hour.

The trail grew harder to follow as they went on.

The trail was warm here, and would grow ever hotter when we got home.