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

The spelunkers explored the ancient caves and discovered prehistoric paintings.

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

The old tunnel showed signs of caving in as the tremors continued.

During the storm, the old barn roof caved in under the weight of the snow.

Every Friday, our imam encourages us to study Cave because its stories teach humility and hope.

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.

The mine was closed after a dangerous cave-in blocked the main tunnel.

During the rescue training, the instructor warned that if we removed the props the roof might cave-in unexpectedly.