A sudden collapse or falling in of the roof or walls of a cave, mine, tunnel, or similar excavated space.
2.
Globalneutral
A sudden failure or collapse of support, structure, or resistance, used figuratively to describe the abrupt breakdown of an organization, plan, or resolve.
3.
Globalinformal
To collapse inward or fall in as a structure; to give way suddenly.
To yield or submit under pressure; to relent or give up one's position or resistance.