Примеры употребления для Stiffen
1. The media resolve to stiffen its spine would come later.
2. If she made a mistake, Sara would visibly stiffen.
3. Others ‘feel‘ strong winds and stiffen themselves against buffeting.
4. The senator said he is willing to stiffen those requirements.
5. The condition causes the heart muscle to stiffen so that it cannot relax properly between beats.