- To close tightly: clench one's teeth; clenched my fists in anger.
- To grasp or grip tightly: clenched the steering wheel.
- To clinch (a bolt, for example).
- Nautical To fasten with a clinch.
- A tight grip or grasp.
- Something, such as a mechanical device, that clenches or holds fast.
- Nautical See clinch.