To keep from screaming, she bit down hard on her lip.

It gave her something to do besides stand there and try to keep from screaming.

I ground my back teeth together to keep from screaming.

She was hardly able to keep herself from screaming at him.

He bit down on his hand to keep from screaming.

It was all he could do to keep from screaming.

I had to stop and take a few deep breaths to keep from screaming at him.

In shock, it had been all she could do to keep from screaming.

She bit down hard on her lower lip to keep from screaming.

He ground his teeth together to keep from screaming and did it again.