To fasten or hold something tightly in place with a clamp. He clamped the pieces of wood together to ensure they didn't move while the glue dried.
To impose or enforce (something) strictly. The authorities clamped stringent controls on currency exchange.
To attach a wheel clamp to (a vehicle) so as to immobilize it. The parking officer clamped the illegally parked car.
To store (root crops such as potatoes) in an outdoor heap covered with straw, earth, or similar material for protection. After the harvest, they clamped the carrots to keep them from freezing over the winter.