31. Williams said, clenching both fists. 32. By dark I don't mean just the cinematography or the heart-clenching ending. 33. Djilas said, clenching his hands. 34. Bruxism is an oral parafunctional activity where there is excessive clenching and grinding of the teeth. 35. Bruxism, also known as clenching of or grinding on teeth, destroys enamel very quickly. 36. Showing the back of the hand or clenching hands into fists may represent a closed posture. 37. Clenching a fist evokes the later.38. Clenching his teeth and wrapping both hands around the bat, he strides off to home plate.39. Kasparov showed his distress in his facial expressions, clenching his jaw muscles, furrowing his brow. 40. She hunched until she trembled, clenching and wringing her hands, and staring at the floor.
