clench

In the moment, the senior forward roared to the arena’s rafters, both of his hands clenched in fists.

It makes my stomach clench and I can breathe and feel a little bit better.’

He spoke with fire in his eyes, often fists clenched for emphasis, not injury.

Writing on Instagram, she said: "I have TMJ and wake most days with awful headaches from tension & jaw clenching."

He often wore wire-rimmed glasses, and his jaw jutted forward, as if clenched.