The thought of breaking into giggles sobered her slightly.

I nodded, but the thought sobered me more than the thought of getting shot had.

The thought sobered Forbin, but did not bother him overmuch.

The thought sobered him and caused no little amount of embarrassment.

As she turned to face her love, though, her thoughts sobered.

The thought sobered him; he dropped the tunic on the floor and sat down again.

The thought sobered her enough to allow him to urge her onwards.

The thought of how close they had been to death sobered them all.

The thought sobered Rory slightly, but not enough to stop him going for the gun.

He valued her insights, and the thought of her fear sobered him further.