A large, naturally-occurring cavity formed underground or in the face of a cliff or a hillside.

“We found a cave on the mountainside where we could take shelter.”

A hole, depression, or gap in earth or rock, whether natural or man-made.

A storage cellar, especially for wine or cheese.

“This wine has been aged in our cave for thirty years.”

To surrender.

“He caved under pressure.”

To collapse.

“First the braces buckled, then the roof began to cave, then we ran.”

To hollow out or undermine.

“The levee has been severely caved by the river current.”