Mother set her mouth in a grim line and did not answer.

Larry's face was set in grim lines as he sat down next to the table.

We stood together, in this case at least, on the same side of that grim and arbitrary line.

She appeared to have more to say, but instead closed her mouth in a grim line.

She shut her mouth in a grim line and said nothing.

"She did it over two years ago," His mouth was a grim line.

His mouth set in a grim line, he pressed a hand to her heart.

She seemed determined, her mouth set in a grim line.

But- She looked to the bed and set her lips in a grim line.

Her mouth set in a grim line, she went to the kitchen door.