It was darkening fast.

Hie cold afternoon was darkening fast; and his fat profile, against the dimming fight, showed panting and angry.

The sky was darkening fast.

The sky was darkening fast, and he wondered whether night would fall quickly enough to help him.

For a long time hunted and hunter held their weird, fleet course, and the day was darkening fast.

But he just turned and stared out of the window at the murky grey landscape that was darkening fast.

The air smelt keener, the afternoons were darkening fast.

We left at three that afternoon, the sky darkening fast.

My blood was suffused with the antisunburn chemicals, and my skin darkened fast as the morning wore on.

Now the sun was down and the sky was darkening fast.