His jaw clenched as if he could not make himself say the word.

The captain's jaw clenched with the weight of decision making.

His jaw clenched as I laid it out for him.

Neil's jaw clenched as he gave her what she wanted.

Jaw clenched, I stood up and put the fountain between us.

His jaw clenched but he made no move to dump me onto the floor.

Six or seven seconds, we would have been through, she thought, her jaw clenching.

His jaw clenched so hard he looked as if he'd been carved from stone.

I stood up by degrees and nodded, my jaw clenched.

My jaw clenched, but then I forced myself to relax.