If no one reinforces the hillside, the unstable soil caves in during heavy rain.

Caving under the weight of responsibility, he admitted his mistake.

Caving in the limestone karst requires careful preparation and respect for fragile formations.

The spelunkers explored the ancient caves and discovered prehistoric paintings.

When negotiations stall, he caves to compromise sooner than I expected.

By morning, the abandoned mine shaft had caved, sealing off the lower tunnels.

Her weekend cavings took her to three different limestone systems, each more beautiful and challenging than the last.

Before sealing the cavern, they pumped out a caveful of water to prevent flooding.

The explorers hauled cavefuls of bat guano out of the caverns, hoping to use it as fertilizer.

cave lions once stalked the icy plains at the edge of the glacier, leaving massive paw prints in the snow.