1. 磨牙癖：clement 仁慈 | clenching 磨牙癖 | cleptomania 偷窃狂
1. The fuming star was also shown clenching his teeth and muttering expletives as he stood with his arms crossed tightly across his chest.
2. Conservation groups are already clenching their fists, preparing to fight this as an environmental battle.
3. The medical term used to describe the unconscious act of teeth grinding and clenching of the jaws is bruxism.