cave

(kāv)

1. A hollow or natural passage under or into the earth, especially one with an opening to the surface.
2. A storage cellar, especially for wine.

1. To dig or hollow out.
2. To cause to collapse or fall in. Often used with in: The impact caved in the roof of the car.

1. To fall in; collapse. Often used with in: The walls caved in during the earthquake.
2. To give up all opposition; yield. Often used with in: The school committee caved in to the demands of parents.
3. To explore caves.