Almost at the same time, the mist thickened and the sun was lost to view.

No mist thickened to put forth fingers closing about the hilt.

The mist thickened and puffed as though fed by some hidden fire.

Lying on her side, she let the mist thicken until she could no longer see him.

The mist is very thick and can thicken even more.

The mist thickened into drizzle as we headed back toward the road, continuing the conversation.

The mist was thickening, he had come to accept it now.

The mist had thickened to a slow, cold drizzle.

The mists were thickening, moving slowly among the trees like restless thoughts.

The mist thickens and I can see no more.