He looked down and saw a dark patch appear and spread on his pants.

Two clear patches formed on the bottom of the windshield and slowly spread upward.

There are yellow patches, small right now but spreading.

The patch is spreading at nearly the speed of light.

As it left the village, other patches of flame were spreading.

Numerous blackish patches spread on the surface, showing the formation of fresh ice.

The initial exposed small patch of sand gradually spread and overtook the entire farm.

The water was icy cold, and patches of ice were spreading across its surface.

The clouds were breaking up and patches of blue were spreading across the sky.

But notice how the patch of light is spreading.