Her hands tightened on his and did not let go.

But her other hand had tightened on the edge of the window.

As it was, I could only tighten my hold on him.

As he started to get up, she tightened her hand on his, keeping him in place.

Even his hands did not tighten on the arms of the chair.

Her hands tightened on the arms of the chair with the effort.

But his hands tightened on the arms of the chair.

He tried to tighten his hold on her, but didn't have the strength.

Her right hand tightened on the arm of the chair.

The other men have tightened their hold on me, at his signal.