When he read it, Saul turned grim but said nothing.

But once the competition grows, the party can turn grim.

The mood turned grim as the official found Flight 655.

The next thought that hit Web made his features turn grim.

The face of the figure standing before her turned grim.

Now, however, it was getting dark and conditions were turning grim.

And apparently that was so; his dark face had turned grim.

It is there that events turn grim and the scheme of the movie begins to show.

In the bad light he looked around the circle of heads, whose expressions turned grim.

Upon being told that this isn't the case, he turns grim.