Here the trail grows cold.
After that, the trail grows thin.
The hunt for the terrorist's electronic trail grew intensive.
As the company passed to new owners, the trail grew even colder.
The trail grew much steeper and rockier and though the rain was quite steady, I relented and closed the umbrella, using it as a hiking pole.
But as the trail grows colder, some of those troops are turning their attention to other tasks, like providing security, rebuilding schools and roads, and training soldiers.
Above the 3.1-mile marker where I had given up, the trail grew markedly steeper and at times we had to climb up sections of smooth rock.
The trail grows murkier afterward, but Mr. Forcellino cites circumstantial evidence in arguing that, after Pole's death, the painting ended up with the Archbishop of Ragusa — now Dubrovnik, Croatia.
As the Bin Laden trail grew cold and he stopped broadcasting videos to the world in the last several years, his status as the world's most influential terrorist seemed to diminish.
This is where the trail grows tricky, for what had been charitable suddenly crosses a line that tax law and moral convention think inviolable -- it turns commercial, and no one likes to talk very much about what happens next.
