Caved

verb

1. To surrender.

   "He caved under pressure."

2. To collapse.

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

3. To hollow out or undermine.

   "The levee has been severely caved by the river current."

4. To engage in the recreational exploration of caves.

   "I have caved from Yugoslavia to Kentucky."

5. In room-and-pillar mining, to extract a deposit of rock by breaking down a pillar which had been holding it in place.

   "The deposit is caved by knocking out the posts."