darkens

The sky above the mosque darkens, splits, and rain starts hammering down.

Tens of thousands line up to pay their respects as Hurricane Danny moves slowly up the Atlantic seaboard and darkens the sky.

In time this slightly darkens the colour of the leather, but it keeps it from cracking.

The beard increases; the hair becomes crisper; and the complexion darkens.

The shade of gravity which so usually darkens his poetry, is often heightened to the most solemn seriousness.

Between Rickie and Gerald there lay a shadow that darkens life more often than we suppose.

There seems to be a shuddering in the branches—the light fades upon yonder sunny woodlands—the foreground darkens apace.