- a collapse, as of anything hollow: the worst cave-in in the history of mining.
- a place or site of such a collapse.
- submission to something or someone previously opposed or resisted: His cave-in to such unreasonable demands shocked us.
- to collapse; subside
- to yield completely, esp under pressure
- the sudden collapse of a roof, piece of ground, etc, into a hollow beneath it; subsidence
- the site of such a collapse, as at a mine or tunnel
- an instance of yielding completely, esp under pressure
